31123231973 has 2 divisors, whose sum is σ = 31123231974. Its totient is φ = 31123231972.

The previous prime is 31123231957. The next prime is 31123231991. The reversal of 31123231973 is 37913232113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30148418689 + 974813284 = 173633^2 + 31222^2 .

It is a cyclic number.

It is not a de Polignac number, because 31123231973 - 2⁴ = 31123231957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31123231673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561615986 + 15561615987.

It is an arithmetic number, because the mean of its divisors is an integer number (15561615987).

Almost surely, 2^31123231973 is an apocalyptic number.

It is an amenable number.

31123231973 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123231973 is an equidigital number, since it uses as much as digits as its factorization.

31123231973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 35.

The spelling of 31123231973 in words is "thirty-one billion, one hundred twenty-three million, two hundred thirty-one thousand, nine hundred seventy-three".