31431515223 has 4 divisors (see below), whose sum is σ = 41908686968. Its totient is φ = 20954343480.

The previous prime is 31431515209. The next prime is 31431515233. The reversal of 31431515223 is 32251513413.

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

It is not a de Polignac number, because 31431515223 - 2⁸ = 31431514967 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 (31431515233) 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, 5238585868 + ... + 5238585873.

It is an arithmetic number, because the mean of its divisors is an integer number (10477171742).

Almost surely, 2^31431515223 is an apocalyptic number.

31431515223 is a deficient number, since it is larger than the sum of its proper divisors (10477171745).

31431515223 is a wasteful number, since it uses less digits than its factorization.

31431515223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10477171744.

The product of its digits is 10800, while the sum is 30.

The spelling of 31431515223 in words is "thirty-one billion, four hundred thirty-one million, five hundred fifteen thousand, two hundred twenty-three".