31045047213 has 4 divisors (see below), whose sum is σ = 41393396288. Its totient is φ = 20696698140.

The previous prime is 31045047191. The next prime is 31045047221. The reversal of 31045047213 is 31274054013.

It is a happy number.

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: 31274054013 = 3 ⋅10424684671.

It is not a de Polignac number, because 31045047213 - 2⁵ = 31045047181 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 (31045047263) 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, 5174174533 + ... + 5174174538.

It is an arithmetic number, because the mean of its divisors is an integer number (10348349072).

Almost surely, 2^31045047213 is an apocalyptic number.

It is an amenable number.

31045047213 is a deficient number, since it is larger than the sum of its proper divisors (10348349075).

31045047213 is a wasteful number, since it uses less digits than its factorization.

31045047213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10348349074.

The product of its (nonzero) digits is 10080, while the sum is 30.

The spelling of 31045047213 in words is "thirty-one billion, forty-five million, forty-seven thousand, two hundred thirteen".