91115131 has 2 divisors, whose sum is σ = 91115132. Its totient is φ = 91115130.

The previous prime is 91115119. The next prime is 91115137. The reversal of 91115131 is 13151119.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91115131 - 2¹⁵ = 91082363 is a prime.

It is a super-2 number, since 2×91115131² = 16603934194294322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91115137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45557565 + 45557566.

It is an arithmetic number, because the mean of its divisors is an integer number (45557566).

Almost surely, 2^91115131 is an apocalyptic number.

91115131 is a deficient number, since it is larger than the sum of its proper divisors (1).

91115131 is an equidigital number, since it uses as much as digits as its factorization.

91115131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 135, while the sum is 22.

The square root of 91115131 is about 9545.4246107756. The cubic root of 91115131 is about 449.9837541460.

The spelling of 91115131 in words is "ninety-one million, one hundred fifteen thousand, one hundred thirty-one".