91914640954 has 4 divisors (see below), whose sum is σ = 137871961434. Its totient is φ = 45957320476.

The previous prime is 91914640949. The next prime is 91914640967. The reversal of 91914640954 is 45904641919.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45904641919 = 1619 ⋅28353701.

It can be written as a sum of positive squares in only one way, i.e., 66767976025 + 25146664929 = 258395^2 + 158577^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22978660237 + ... + 22978660240.

Almost surely, 2^91914640954 is an apocalyptic number.

91914640954 is a deficient number, since it is larger than the sum of its proper divisors (45957320480).

91914640954 is a wasteful number, since it uses less digits than its factorization.

91914640954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45957320479.

The product of its (nonzero) digits is 1399680, while the sum is 52.

The spelling of 91914640954 in words is "ninety-one billion, nine hundred fourteen million, six hundred forty thousand, nine hundred fifty-four".