15400031231 has 32 divisors (see below), whose sum is σ = 17498460672. Its totient is φ = 13454138880.

The previous prime is 15400031209. The next prime is 15400031237. The reversal of 15400031231 is 13213000451.

It is a de Polignac number, because none of the positive numbers 2^k-15400031231 is a prime.

It is a super-2 number, since 2×15400031231² (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 (15400031237) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7965941 + ... + 7967873.

It is an arithmetic number, because the mean of its divisors is an integer number (546826896).

Almost surely, 2^15400031231 is an apocalyptic number.

15400031231 is a deficient number, since it is larger than the sum of its proper divisors (2098429441).

15400031231 is a wasteful number, since it uses less digits than its factorization.

15400031231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403.

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 15400031231 its reverse (13213000451), we get a palindrome (28613031682).

The spelling of 15400031231 in words is "fifteen billion, four hundred million, thirty-one thousand, two hundred thirty-one".