91113977 has 2 divisors, whose sum is σ = 91113978. Its totient is φ = 91113976.

The previous prime is 91113973. The next prime is 91114003. The reversal of 91113977 is 77931119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82882816 + 8231161 = 9104^2 + 2869^2 .

It is a cyclic number.

It is not a de Polignac number, because 91113977 - 2² = 91113973 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91113977.

It is not a weakly prime, because it can be changed into another prime (91113973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45556988 + 45556989.

It is an arithmetic number, because the mean of its divisors is an integer number (45556989).

Almost surely, 2^91113977 is an apocalyptic number.

It is an amenable number.

91113977 is a deficient number, since it is larger than the sum of its proper divisors (1).

91113977 is an equidigital number, since it uses as much as digits as its factorization.

91113977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11907, while the sum is 38.

The square root of 91113977 is about 9545.3641627756. The cubic root of 91113977 is about 449.9818544123.

The spelling of 91113977 in words is "ninety-one million, one hundred thirteen thousand, nine hundred seventy-seven".