91987018252 has 6 divisors (see below), whose sum is σ = 160977281948. Its totient is φ = 45993509124.

The previous prime is 91987018229. The next prime is 91987018259. The reversal of 91987018252 is 25281078919.

It is a super-2 number, since 2×91987018252² (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 91987018252.

It is not an unprimeable number, because it can be changed into a prime (91987018259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11498377278 + ... + 11498377285.

Almost surely, 2^91987018252 is an apocalyptic number.

It is an amenable number.

91987018252 is a deficient number, since it is larger than the sum of its proper divisors (68990263696).

91987018252 is a wasteful number, since it uses less digits than its factorization.

91987018252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22996754567 (or 22996754565 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 52.

The spelling of 91987018252 in words is "ninety-one billion, nine hundred eighty-seven million, eighteen thousand, two hundred fifty-two".