77717231 has 2 divisors, whose sum is σ = 77717232. Its totient is φ = 77717230.

The previous prime is 77717209. The next prime is 77717257. The reversal of 77717231 is 13271777.

It is a weak prime.

It is an emirp because it is prime and its reverse (13271777) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77717231 - 2¹⁸ = 77455087 is a prime.

It is a super-2 number, since 2×77717231² = 12079935988614722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77717191 and 77717200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77717281) 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 as a sum of consecutive naturals, namely, 38858615 + 38858616.

It is an arithmetic number, because the mean of its divisors is an integer number (38858616).

Almost surely, 2^77717231 is an apocalyptic number.

77717231 is a deficient number, since it is larger than the sum of its proper divisors (1).

77717231 is an equidigital number, since it uses as much as digits as its factorization.

77717231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14406, while the sum is 35.

The square root of 77717231 is about 8815.7376889288. The cubic root of 77717231 is about 426.7489287052.

The spelling of 77717231 in words is "seventy-seven million, seven hundred seventeen thousand, two hundred thirty-one".