231321512451 has 32 divisors (see below), whose sum is σ = 317537206272. Its totient is φ = 149706779040.

The previous prime is 231321512363. The next prime is 231321512473. The reversal of 231321512451 is 154215123132.

It is a happy number.

It is not a de Polignac number, because 231321512451 - 2¹³ = 231321504259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231321512951) 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, 15021966 + ... + 15037356.

It is an arithmetic number, because the mean of its divisors is an integer number (9923037696).

Almost surely, 2^231321512451 is an apocalyptic number.

231321512451 is a deficient number, since it is larger than the sum of its proper divisors (86215693821).

231321512451 is a wasteful number, since it uses less digits than its factorization.

231321512451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16143.

The product of its digits is 7200, while the sum is 30.

Adding to 231321512451 its reverse (154215123132), we get a palindrome (385536635583).

The spelling of 231321512451 in words is "two hundred thirty-one billion, three hundred twenty-one million, five hundred twelve thousand, four hundred fifty-one".