47481781 has 4 divisors (see below), whose sum is σ = 47609452. Its totient is φ = 47354112.

The previous prime is 47481769. The next prime is 47481793. The reversal of 47481781 is 18718474.

47481781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18718474 = 2 ⋅9359237.

It is an interprime number because it is at equal distance from previous prime (47481769) and next prime (47481793).

It can be written as a sum of positive squares in 2 ways, for example, as 34456900 + 13024881 = 5870^2 + 3609^2 .

It is a cyclic number.

It is not a de Polignac number, because 47481781 - 2⁷ = 47481653 is a prime.

It is a super-2 number, since 2×47481781² = 4509039053863922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47481701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63276 + ... + 64021.

It is an arithmetic number, because the mean of its divisors is an integer number (11902363).

Almost surely, 2^47481781 is an apocalyptic number.

It is an amenable number.

47481781 is a deficient number, since it is larger than the sum of its proper divisors (127671).

47481781 is a wasteful number, since it uses less digits than its factorization.

47481781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127670.

The product of its digits is 50176, while the sum is 40.

The square root of 47481781 is about 6890.7025040993. The cubic root of 47481781 is about 362.1115134203. Note that the first 3 decimals are identical.

The spelling of 47481781 in words is "forty-seven million, four hundred eighty-one thousand, seven hundred eighty-one".