91503212431 has 4 divisors (see below), whose sum is σ = 96319171000. Its totient is φ = 86687253864.

The previous prime is 91503212377. The next prime is 91503212441. The reversal of 91503212431 is 13421230519.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91503212431 is a prime.

It is a super-2 number, since 2×91503212431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91503212393 and 91503212402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91503212441) 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, 2407979256 + ... + 2407979293.

It is an arithmetic number, because the mean of its divisors is an integer number (24079792750).

Almost surely, 2^91503212431 is an apocalyptic number.

91503212431 is a deficient number, since it is larger than the sum of its proper divisors (4815958569).

91503212431 is a wasteful number, since it uses less digits than its factorization.

91503212431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4815958568.

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 91503212431 in words is "ninety-one billion, five hundred three million, two hundred twelve thousand, four hundred thirty-one".