31268540913 has 4 divisors (see below), whose sum is σ = 41691387888. Its totient is φ = 20845693940.

The previous prime is 31268540911. The next prime is 31268540923. The reversal of 31268540913 is 31904586213.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31904586213 = 3 ⋅10634862071.

It is a cyclic number.

It is not a de Polignac number, because 31268540913 - 2¹ = 31268540911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31268540911) 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, 5211423483 + ... + 5211423488.

It is an arithmetic number, because the mean of its divisors is an integer number (10422846972).

Almost surely, 2^31268540913 is an apocalyptic number.

It is an amenable number.

31268540913 is a deficient number, since it is larger than the sum of its proper divisors (10422846975).

31268540913 is a wasteful number, since it uses less digits than its factorization.

31268540913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10422846974.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 31268540913 in words is "thirty-one billion, two hundred sixty-eight million, five hundred forty thousand, nine hundred thirteen".