47020781 has 4 divisors (see below), whose sum is σ = 47359200. Its totient is φ = 46682364.

The previous prime is 47020777. The next prime is 47020789. The reversal of 47020781 is 18702074.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 47020781 - 2² = 47020777 is a prime.

It is a super-2 number, since 2×47020781² = 4421907691699922, 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 (47020789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169001 + ... + 169278.

It is an arithmetic number, because the mean of its divisors is an integer number (11839800).

Almost surely, 2^47020781 is an apocalyptic number.

It is an amenable number.

47020781 is a deficient number, since it is larger than the sum of its proper divisors (338419).

47020781 is a wasteful number, since it uses less digits than its factorization.

47020781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338418.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 47020781 is about 6857.1700431009. The cubic root of 47020781 is about 360.9357881305.

The spelling of 47020781 in words is "forty-seven million, twenty thousand, seven hundred eighty-one".