31230123131 has 4 divisors (see below), whose sum is σ = 31231974312. Its totient is φ = 31228271952.

The previous prime is 31230123049. The next prime is 31230123149. The reversal of 31230123131 is 13132103213.

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

It is a cyclic number.

It is not a de Polignac number, because 31230123131 - 2²² = 31225928827 is a prime.

It is a super-2 number, since 2×31230123131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31230123931) 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, 900050 + ... + 934103.

It is an arithmetic number, because the mean of its divisors is an integer number (7807993578).

Almost surely, 2^31230123131 is an apocalyptic number.

31230123131 is a deficient number, since it is larger than the sum of its proper divisors (1851181).

31230123131 is a wasteful number, since it uses less digits than its factorization.

31230123131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851180.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31230123131 its reverse (13132103213), we get a palindrome (44362226344).

The spelling of 31230123131 in words is "thirty-one billion, two hundred thirty million, one hundred twenty-three thousand, one hundred thirty-one".