77939231 has 2 divisors, whose sum is σ = 77939232. Its totient is φ = 77939230.

The previous prime is 77939189. The next prime is 77939243. The reversal of 77939231 is 13293977.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77939231 - 2⁶ = 77939167 is a prime.

It is a super-2 number, since 2×77939231² = 12149047457742722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77939431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38969615 + 38969616.

It is an arithmetic number, because the mean of its divisors is an integer number (38969616).

Almost surely, 2^77939231 is an apocalyptic number.

77939231 is a deficient number, since it is larger than the sum of its proper divisors (1).

77939231 is an equidigital number, since it uses as much as digits as its factorization.

77939231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71442, while the sum is 41.

The square root of 77939231 is about 8828.3198288236. The cubic root of 77939231 is about 427.1548798563.

The spelling of 77939231 in words is "seventy-seven million, nine hundred thirty-nine thousand, two hundred thirty-one".