91954991957 has 2 divisors, whose sum is σ = 91954991958. Its totient is φ = 91954991956.

The previous prime is 91954991951. The next prime is 91954992091. The reversal of 91954991957 is 75919945919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91127911876 + 827080081 = 301874^2 + 28759^2 .

It is a cyclic number.

It is not a de Polignac number, because 91954991957 - 2¹⁶ = 91954926421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91954991951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45977495978 + 45977495979.

It is an arithmetic number, because the mean of its divisors is an integer number (45977495979).

Almost surely, 2^91954991957 is an apocalyptic number.

It is an amenable number.

91954991957 is a deficient number, since it is larger than the sum of its proper divisors (1).

91954991957 is an equidigital number, since it uses as much as digits as its factorization.

91954991957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41334300, while the sum is 68.

The spelling of 91954991957 in words is "ninety-one billion, nine hundred fifty-four million, nine hundred ninety-one thousand, nine hundred fifty-seven".