91103621131 has 2 divisors, whose sum is σ = 91103621132. Its totient is φ = 91103621130.

The previous prime is 91103621093. The next prime is 91103621153. The reversal of 91103621131 is 13112630119.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91103621131 is a prime.

It is a super-2 number, since 2×91103621131² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91103621131.

It is not a weakly prime, because it can be changed into another prime (91103621731) 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, 45551810565 + 45551810566.

It is an arithmetic number, because the mean of its divisors is an integer number (45551810566).

Almost surely, 2^91103621131 is an apocalyptic number.

91103621131 is a deficient number, since it is larger than the sum of its proper divisors (1).

91103621131 is an equidigital number, since it uses as much as digits as its factorization.

91103621131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The spelling of 91103621131 in words is "ninety-one billion, one hundred three million, six hundred twenty-one thousand, one hundred thirty-one".