31124042231 has 4 divisors (see below), whose sum is σ = 31183553352. Its totient is φ = 31064531112.

The previous prime is 31124042227. The next prime is 31124042251. The reversal of 31124042231 is 13224042113.

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 31124042231 - 2² = 31124042227 is a prime.

It is a super-2 number, since 2×31124042231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31124042197 and 31124042206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31124042251) 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, 29754776 + ... + 29755821.

It is an arithmetic number, because the mean of its divisors is an integer number (7795888338).

Almost surely, 2^31124042231 is an apocalyptic number.

31124042231 is a deficient number, since it is larger than the sum of its proper divisors (59511121).

31124042231 is an equidigital number, since it uses as much as digits as its factorization.

31124042231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59511120.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 31124042231 its reverse (13224042113), we get a palindrome (44348084344).

The spelling of 31124042231 in words is "thirty-one billion, one hundred twenty-four million, forty-two thousand, two hundred thirty-one".