231664973 has 2 divisors, whose sum is σ = 231664974. Its totient is φ = 231664972.

The previous prime is 231664957. The next prime is 231664981. The reversal of 231664973 is 379466132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226291849 + 5373124 = 15043^2 + 2318^2 .

It is a cyclic number.

It is not a de Polignac number, because 231664973 - 2⁴ = 231664957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231664973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231664913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115832486 + 115832487.

It is an arithmetic number, because the mean of its divisors is an integer number (115832487).

Almost surely, 2^231664973 is an apocalyptic number.

It is an amenable number.

231664973 is a deficient number, since it is larger than the sum of its proper divisors (1).

231664973 is an equidigital number, since it uses as much as digits as its factorization.

231664973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 41.

The square root of 231664973 is about 15220.5444383570. The cubic root of 231664973 is about 614.1674441728.

The spelling of 231664973 in words is "two hundred thirty-one million, six hundred sixty-four thousand, nine hundred seventy-three".