47578931 has 2 divisors, whose sum is σ = 47578932. Its totient is φ = 47578930.

The previous prime is 47578919. The next prime is 47578961. The reversal of 47578931 is 13987574.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47578931 is a prime.

It is a super-2 number, since 2×47578931² = 4527509350205522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (47578961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23789465 + 23789466.

It is an arithmetic number, because the mean of its divisors is an integer number (23789466).

Almost surely, 2^47578931 is an apocalyptic number.

47578931 is a deficient number, since it is larger than the sum of its proper divisors (1).

47578931 is an equidigital number, since it uses as much as digits as its factorization.

47578931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 44.

The square root of 47578931 is about 6897.7482557716. The cubic root of 47578931 is about 362.3583110150.

The spelling of 47578931 in words is "forty-seven million, five hundred seventy-eight thousand, nine hundred thirty-one".