77556131 has 2 divisors, whose sum is σ = 77556132. Its totient is φ = 77556130.

The previous prime is 77556103. The next prime is 77556151. The reversal of 77556131 is 13165577.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77556131 is a prime.

It is a super-2 number, since 2×77556131² = 12029906911378322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77556091 and 77556100.

It is not a weakly prime, because it can be changed into another prime (77556151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38778065 + 38778066.

It is an arithmetic number, because the mean of its divisors is an integer number (38778066).

Almost surely, 2^77556131 is an apocalyptic number.

77556131 is a deficient number, since it is larger than the sum of its proper divisors (1).

77556131 is an equidigital number, since it uses as much as digits as its factorization.

77556131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22050, while the sum is 35.

The square root of 77556131 is about 8806.5958803615. The cubic root of 77556131 is about 426.4538555289.

The spelling of 77556131 in words is "seventy-seven million, five hundred fifty-six thousand, one hundred thirty-one".