91912786253 has 4 divisors (see below), whose sum is σ = 91980024480. Its totient is φ = 91845548028.

The previous prime is 91912786249. The next prime is 91912786271. The reversal of 91912786253 is 35268721919.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91912786253 - 2² = 91912786249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91912786195 and 91912786204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91912786223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33617063 + ... + 33619796.

It is an arithmetic number, because the mean of its divisors is an integer number (22995006120).

Almost surely, 2^91912786253 is an apocalyptic number.

It is an amenable number.

91912786253 is a deficient number, since it is larger than the sum of its proper divisors (67238227).

91912786253 is a wasteful number, since it uses less digits than its factorization.

91912786253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67238226.

The product of its digits is 1632960, while the sum is 53.

The spelling of 91912786253 in words is "ninety-one billion, nine hundred twelve million, seven hundred eighty-six thousand, two hundred fifty-three".