31223132879 has 2 divisors, whose sum is σ = 31223132880. Its totient is φ = 31223132878.

The previous prime is 31223132873. The next prime is 31223132911. The reversal of 31223132879 is 97823132213.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31223132879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31223132873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15611566439 + 15611566440.

It is an arithmetic number, because the mean of its divisors is an integer number (15611566440).

Almost surely, 2^31223132879 is an apocalyptic number.

31223132879 is a deficient number, since it is larger than the sum of its proper divisors (1).

31223132879 is an equidigital number, since it uses as much as digits as its factorization.

31223132879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 41.

The spelling of 31223132879 in words is "thirty-one billion, two hundred twenty-three million, one hundred thirty-two thousand, eight hundred seventy-nine".