11891225431 has 16 divisors (see below), whose sum is σ = 12062066400. Its totient is φ = 11722088448.

The previous prime is 11891225419. The next prime is 11891225443. The reversal of 11891225431 is 13452219811.

It is an interprime number because it is at equal distance from previous prime (11891225419) and next prime (11891225443).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11891225431 is a prime.

It is a super-2 number, since 2×11891225431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11891225471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11784655 + ... + 11785663.

It is an arithmetic number, because the mean of its divisors is an integer number (753879150).

Almost surely, 2^11891225431 is an apocalyptic number.

11891225431 is a deficient number, since it is larger than the sum of its proper divisors (170840969).

11891225431 is a wasteful number, since it uses less digits than its factorization.

11891225431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1698.

The product of its digits is 17280, while the sum is 37.

The spelling of 11891225431 in words is "eleven billion, eight hundred ninety-one million, two hundred twenty-five thousand, four hundred thirty-one".