31223132929 has 2 divisors, whose sum is σ = 31223132930. Its totient is φ = 31223132928.

The previous prime is 31223132911. The next prime is 31223132933. The reversal of 31223132929 is 92923132213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30214435329 + 1008697600 = 173823^2 + 31760^2 .

It is an emirp because it is prime and its reverse (92923132213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31223132929 - 2³³ = 22633198337 is a prime.

It is not a weakly prime, because it can be changed into another prime (31223132999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15611566464 + 15611566465.

It is an arithmetic number, because the mean of its divisors is an integer number (15611566465).

Almost surely, 2^31223132929 is an apocalyptic number.

It is an amenable number.

31223132929 is a deficient number, since it is larger than the sum of its proper divisors (1).

31223132929 is an equidigital number, since it uses as much as digits as its factorization.

31223132929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 37.

The spelling of 31223132929 in words is "thirty-one billion, two hundred twenty-three million, one hundred thirty-two thousand, nine hundred twenty-nine".