31222232131 has 4 divisors (see below), whose sum is σ = 31734072064. Its totient is φ = 30710392200.

The previous prime is 31222232077. The next prime is 31222232207. The reversal of 31222232131 is 13123222213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13123222213 = 83 ⋅158111111.

It is a cyclic number.

It is not a de Polignac number, because 31222232131 - 2¹⁵ = 31222199363 is a prime.

It is a super-2 number, since 2×31222232131² (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 (31222332131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255919875 + ... + 255919996.

It is an arithmetic number, because the mean of its divisors is an integer number (7933518016).

Almost surely, 2^31222232131 is an apocalyptic number.

31222232131 is a deficient number, since it is larger than the sum of its proper divisors (511839933).

31222232131 is an equidigital number, since it uses as much as digits as its factorization.

31222232131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511839932.

The product of its digits is 864, while the sum is 22.

Adding to 31222232131 its reverse (13123222213), we get a palindrome (44345454344).

The spelling of 31222232131 in words is "thirty-one billion, two hundred twenty-two million, two hundred thirty-two thousand, one hundred thirty-one".