31131723214 has 4 divisors (see below), whose sum is σ = 46697584824. Its totient is φ = 15565861606.

The previous prime is 31131723211. The next prime is 31131723223. The reversal of 31131723214 is 41232713113.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131723211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7782930802 + ... + 7782930805.

It is an arithmetic number, because the mean of its divisors is an integer number (11674396206).

Almost surely, 2^31131723214 is an apocalyptic number.

31131723214 is a deficient number, since it is larger than the sum of its proper divisors (15565861610).

31131723214 is a wasteful number, since it uses less digits than its factorization.

31131723214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15565861609.

The product of its digits is 3024, while the sum is 28.

The spelling of 31131723214 in words is "thirty-one billion, one hundred thirty-one million, seven hundred twenty-three thousand, two hundred fourteen".