31357706643047 has 4 divisors (see below), whose sum is σ = 31357938390360. Its totient is φ = 31357474895736.

The previous prime is 31357706643007. The next prime is 31357706643073. The reversal of 31357706643047 is 74034660775313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31357706643047 is a prime.

It is a super-2 number, since 2×31357706643047² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31357706642983 and 31357706643001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31357706643007) 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, 115670573 + ... + 115941350.

It is an arithmetic number, because the mean of its divisors is an integer number (7839484597590).

Almost surely, 2^{31357706643047} is an apocalyptic number.

31357706643047 is a deficient number, since it is larger than the sum of its proper divisors (231747313).

31357706643047 is a wasteful number, since it uses less digits than its factorization.

31357706643047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231747312.

The product of its (nonzero) digits is 26671680, while the sum is 56.

The spelling of 31357706643047 in words is "thirty-one trillion, three hundred fifty-seven billion, seven hundred six million, six hundred forty-three thousand, forty-seven".