47777491 has 4 divisors (see below), whose sum is σ = 47913192. Its totient is φ = 47641792.

The previous prime is 47777473. The next prime is 47777503. The reversal of 47777491 is 19477774.

It is a happy number.

47777491 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.

It is a cyclic number.

It is not a de Polignac number, because 47777491 - 2⁹ = 47776979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47777461) 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, 67321 + ... + 68026.

It is an arithmetic number, because the mean of its divisors is an integer number (11978298).

Almost surely, 2^47777491 is an apocalyptic number.

47777491 is a deficient number, since it is larger than the sum of its proper divisors (135701).

47777491 is a wasteful number, since it uses less digits than its factorization.

47777491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135700.

The product of its digits is 345744, while the sum is 46.

The square root of 47777491 is about 6912.1263732660. The cubic root of 47777491 is about 362.8616851434.

It can be divided in two parts, 477774 and 91, that multiplied together give a palindrome (43477434).

The spelling of 47777491 in words is "forty-seven million, seven hundred seventy-seven thousand, four hundred ninety-one".