31321432253 has 4 divisors (see below), whose sum is σ = 31329171900. Its totient is φ = 31313692608.

The previous prime is 31321432231. The next prime is 31321432267. The reversal of 31321432253 is 35223412313.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8664258724 + 22657173529 = 93082^2 + 150523^2 .

It is a cyclic number.

It is not a de Polignac number, because 31321432253 - 2²⁶ = 31254323389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321437253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3863750 + ... + 3871847.

It is an arithmetic number, because the mean of its divisors is an integer number (7832292975).

Almost surely, 2^31321432253 is an apocalyptic number.

It is an amenable number.

31321432253 is a deficient number, since it is larger than the sum of its proper divisors (7739647).

31321432253 is an equidigital number, since it uses as much as digits as its factorization.

31321432253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7739646.

The product of its digits is 12960, while the sum is 29.

Adding to 31321432253 its reverse (35223412313), we get a palindrome (66544844566).

The spelling of 31321432253 in words is "thirty-one billion, three hundred twenty-one million, four hundred thirty-two thousand, two hundred fifty-three".