91893801951 has 24 divisors (see below), whose sum is σ = 153261608864. Its totient is φ = 51969392640.

The previous prime is 91893801949. The next prime is 91893801959. The reversal of 91893801951 is 15910839819.

It is not a de Polignac number, because 91893801951 - 2¹ = 91893801949 is a prime.

It is a super-2 number, since 2×91893801951² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91893801959) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7512610 + ... + 7524831.

Almost surely, 2^91893801951 is an apocalyptic number.

91893801951 is a deficient number, since it is larger than the sum of its proper divisors (61367806913).

91893801951 is a wasteful number, since it uses less digits than its factorization.

91893801951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15037551 (or 15037548 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 54.

The spelling of 91893801951 in words is "ninety-one billion, eight hundred ninety-three million, eight hundred one thousand, nine hundred fifty-one".