93517951991 has 2 divisors, whose sum is σ = 93517951992. Its totient is φ = 93517951990.

The previous prime is 93517951931. The next prime is 93517951997. The reversal of 93517951991 is 19915971539.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-93517951991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 93517951991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (93517951997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 46758975995 + 46758975996.

It is an arithmetic number, because the mean of its divisors is an integer number (46758975996).

Almost surely, 2^93517951991 is an apocalyptic number.

93517951991 is a deficient number, since it is larger than the sum of its proper divisors (1).

93517951991 is an equidigital number, since it uses as much as digits as its factorization.

93517951991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3444525, while the sum is 59.

The spelling of 93517951991 in words is "ninety-three billion, five hundred seventeen million, nine hundred fifty-one thousand, nine hundred ninety-one".