31310223013 has 4 divisors (see below), whose sum is σ = 31485140640. Its totient is φ = 31135305388.

The previous prime is 31310223001. The next prime is 31310223041. The reversal of 31310223013 is 31032201313.

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 31310223013 - 2⁹ = 31310222501 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 (31310233013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87458545 + ... + 87458902.

It is an arithmetic number, because the mean of its divisors is an integer number (7871285160).

Almost surely, 2^31310223013 is an apocalyptic number.

It is an amenable number.

31310223013 is a deficient number, since it is larger than the sum of its proper divisors (174917627).

31310223013 is a wasteful number, since it uses less digits than its factorization.

31310223013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174917626.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 31310223013 its reverse (31032201313), we get a palindrome (62342424326).

The spelling of 31310223013 in words is "thirty-one billion, three hundred ten million, two hundred twenty-three thousand, thirteen".