15231121451 has 24 divisors (see below), whose sum is σ = 18864518400. Its totient is φ = 12041074656.

The previous prime is 15231121429. The next prime is 15231121471. The reversal of 15231121451 is 15412113251.

It is not a de Polignac number, because 15231121451 - 2²⁶ = 15164012587 is a prime.

It is a super-2 number, since 2×15231121451² (a number of 21 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 15231121451.

It is not an unprimeable number, because it can be changed into a prime (15231121471) 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, 1650416 + ... + 1659618.

It is an arithmetic number, because the mean of its divisors is an integer number (786021600).

Almost surely, 2^15231121451 is an apocalyptic number.

15231121451 is a deficient number, since it is larger than the sum of its proper divisors (3633396949).

15231121451 is a wasteful number, since it uses less digits than its factorization.

15231121451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10635 (or 10622 counting only the distinct ones).

The product of its digits is 1200, while the sum is 26.

The spelling of 15231121451 in words is "fifteen billion, two hundred thirty-one million, one hundred twenty-one thousand, four hundred fifty-one".