31047630641 has 4 divisors (see below), whose sum is σ = 31054001652. Its totient is φ = 31041259632.

The previous prime is 31047630623. The next prime is 31047630721. The reversal of 31047630641 is 14603674013.

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 20127380641 + 10920250000 = 141871^2 + 104500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31047630641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31047630841) 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, 3178190 + ... + 3187943.

It is an arithmetic number, because the mean of its divisors is an integer number (7763500413).

Almost surely, 2^31047630641 is an apocalyptic number.

It is an amenable number.

31047630641 is a deficient number, since it is larger than the sum of its proper divisors (6371011).

31047630641 is an equidigital number, since it uses as much as digits as its factorization.

31047630641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6371010.

The product of its (nonzero) digits is 36288, while the sum is 35.

The spelling of 31047630641 in words is "thirty-one billion, forty-seven million, six hundred thirty thousand, six hundred forty-one".