31132023231 has 16 divisors (see below), whose sum is σ = 42456803328. Its totient is φ = 20282301600.

The previous prime is 31132023217. The next prime is 31132023253. The reversal of 31132023231 is 13232023113.

It is not a de Polignac number, because 31132023231 - 2¹³ = 31132015039 is a prime.

It is a super-2 number, since 2×31132023231² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31132023198 and 31132023207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31132023331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73815 + ... + 260216.

It is an arithmetic number, because the mean of its divisors is an integer number (2653550208).

Almost surely, 2^31132023231 is an apocalyptic number.

31132023231 is a deficient number, since it is larger than the sum of its proper divisors (11324780097).

31132023231 is a wasteful number, since it uses less digits than its factorization.

31132023231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334742.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31132023231 its reverse (13232023113), we get a palindrome (44364046344).

The spelling of 31132023231 in words is "thirty-one billion, one hundred thirty-two million, twenty-three thousand, two hundred thirty-one".