77497797131 has 2 divisors, whose sum is σ = 77497797132. Its totient is φ = 77497797130.

The previous prime is 77497797121. The next prime is 77497797137. The reversal of 77497797131 is 13179779477.

It is a strong prime.

It is an emirp because it is prime and its reverse (13179779477) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77497797131 - 2¹⁴ = 77497780747 is a prime.

It is a super-2 number, since 2×77497797131² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77497797137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38748898565 + 38748898566.

It is an arithmetic number, because the mean of its divisors is an integer number (38748898566).

Almost surely, 2^77497797131 is an apocalyptic number.

77497797131 is a deficient number, since it is larger than the sum of its proper divisors (1).

77497797131 is an equidigital number, since it uses as much as digits as its factorization.

77497797131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16336404, while the sum is 62.

The spelling of 77497797131 in words is "seventy-seven billion, four hundred ninety-seven million, seven hundred ninety-seven thousand, one hundred thirty-one".