31261025161253 has 4 divisors (see below), whose sum is σ = 32620200168288. Its totient is φ = 29901850154220.

The previous prime is 31261025161237. The next prime is 31261025161271. The reversal of 31261025161253 is 35216152016213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31261025161253 - 2⁴ = 31261025161237 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 (31261025161273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 679587503483 + ... + 679587503528.

It is an arithmetic number, because the mean of its divisors is an integer number (8155050042072).

Almost surely, 2^{31261025161253} is an apocalyptic number.

It is an amenable number.

31261025161253 is a deficient number, since it is larger than the sum of its proper divisors (1359175007035).

31261025161253 is a wasteful number, since it uses less digits than its factorization.

31261025161253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359175007034.

The product of its (nonzero) digits is 64800, while the sum is 38.

Adding to 31261025161253 its reverse (35216152016213), we get a palindrome (66477177177466).

The spelling of 31261025161253 in words is "thirty-one trillion, two hundred sixty-one billion, twenty-five million, one hundred sixty-one thousand, two hundred fifty-three".