231312220973 has 2 divisors, whose sum is σ = 231312220974. Its totient is φ = 231312220972.

The previous prime is 231312220913. The next prime is 231312221053. The reversal of 231312220973 is 379022213132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226807395049 + 4504825924 = 476243^2 + 67118^2 .

It is a cyclic number.

It is not a de Polignac number, because 231312220973 - 2¹⁰ = 231312219949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231312220913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115656110486 + 115656110487.

It is an arithmetic number, because the mean of its divisors is an integer number (115656110487).

Almost surely, 2^231312220973 is an apocalyptic number.

It is an amenable number.

231312220973 is a deficient number, since it is larger than the sum of its proper divisors (1).

231312220973 is an equidigital number, since it uses as much as digits as its factorization.

231312220973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 35.

The spelling of 231312220973 in words is "two hundred thirty-one billion, three hundred twelve million, two hundred twenty thousand, nine hundred seventy-three".