77513231 has 2 divisors, whose sum is σ = 77513232. Its totient is φ = 77513230.

The previous prime is 77513167. The next prime is 77513269. The reversal of 77513231 is 13231577.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77513231 - 2⁶ = 77513167 is a prime.

It is a super-2 number, since 2×77513231² = 12016601960118722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77513194 and 77513203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77513281) 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 as a sum of consecutive naturals, namely, 38756615 + 38756616.

It is an arithmetic number, because the mean of its divisors is an integer number (38756616).

Almost surely, 2^77513231 is an apocalyptic number.

77513231 is a deficient number, since it is larger than the sum of its proper divisors (1).

77513231 is an equidigital number, since it uses as much as digits as its factorization.

77513231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4410, while the sum is 29.

The square root of 77513231 is about 8804.1598690619. The cubic root of 77513231 is about 426.3752103616.

The spelling of 77513231 in words is "seventy-seven million, five hundred thirteen thousand, two hundred thirty-one".