31277812213 has 16 divisors (see below), whose sum is σ = 32231054016. Its totient is φ = 30342072960.

The previous prime is 31277812207. The next prime is 31277812259. The reversal of 31277812213 is 31221877213.

It is a cyclic number.

It is not a de Polignac number, because 31277812213 - 2⁹ = 31277811701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31277812913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1364023 + ... + 1386763.

It is an arithmetic number, because the mean of its divisors is an integer number (2014440876).

Almost surely, 2^31277812213 is an apocalyptic number.

It is an amenable number.

31277812213 is a deficient number, since it is larger than the sum of its proper divisors (953241803).

31277812213 is a wasteful number, since it uses less digits than its factorization.

31277812213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23124.

The product of its digits is 28224, while the sum is 37.

The spelling of 31277812213 in words is "thirty-one billion, two hundred seventy-seven million, eight hundred twelve thousand, two hundred thirteen".