31520312253 has 6 divisors (see below), whose sum is σ = 45529339934. Its totient is φ = 21013541496.

The previous prime is 31520312233. The next prime is 31520312261. The reversal of 31520312253 is 35221302513.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 30290617764 + 1229694489 = 174042^2 + 35067^2 .

It is not a de Polignac number, because 31520312253 - 2¹⁴ = 31520295869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31520312233) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1751128450 + ... + 1751128467.

Almost surely, 2^31520312253 is an apocalyptic number.

It is an amenable number.

31520312253 is a deficient number, since it is larger than the sum of its proper divisors (14009027681).

31520312253 is a wasteful number, since it uses less digits than its factorization.

31520312253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3502256923 (or 3502256920 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

Adding to 31520312253 its reverse (35221302513), we get a palindrome (66741614766).

The spelling of 31520312253 in words is "thirty-one billion, five hundred twenty million, three hundred twelve thousand, two hundred fifty-three".