77655131 has 2 divisors, whose sum is σ = 77655132. Its totient is φ = 77655130.

The previous prime is 77655121. The next prime is 77655181. The reversal of 77655131 is 13155677.

It is a weak prime.

It is an emirp because it is prime and its reverse (13155677) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77655131 is a prime.

It is a super-2 number, since 2×77655131² = 12060638741254322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 77655091 and 77655100.

It is not a weakly prime, because it can be changed into another prime (77655121) 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, 38827565 + 38827566.

It is an arithmetic number, because the mean of its divisors is an integer number (38827566).

Almost surely, 2^77655131 is an apocalyptic number.

77655131 is a deficient number, since it is larger than the sum of its proper divisors (1).

77655131 is an equidigital number, since it uses as much as digits as its factorization.

77655131 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 77655131 is about 8812.2148748201. The cubic root of 77655131 is about 426.6352337548.

The spelling of 77655131 in words is "seventy-seven million, six hundred fifty-five thousand, one hundred thirty-one".