31723752497 has 2 divisors, whose sum is σ = 31723752498. Its totient is φ = 31723752496.

The previous prime is 31723752457. The next prime is 31723752499. The reversal of 31723752497 is 79425732713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31685424016 + 38328481 = 178004^2 + 6191^2 .

It is a cyclic number.

It is not a de Polignac number, because 31723752497 - 2¹⁰ = 31723751473 is a prime.

Together with 31723752499, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31723752499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15861876248 + 15861876249.

It is an arithmetic number, because the mean of its divisors is an integer number (15861876249).

Almost surely, 2^31723752497 is an apocalyptic number.

It is an amenable number.

31723752497 is a deficient number, since it is larger than the sum of its proper divisors (1).

31723752497 is an equidigital number, since it uses as much as digits as its factorization.

31723752497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2222640, while the sum is 50.

The spelling of 31723752497 in words is "thirty-one billion, seven hundred twenty-three million, seven hundred fifty-two thousand, four hundred ninety-seven".