331726397 has 2 divisors, whose sum is σ = 331726398. Its totient is φ = 331726396.

The previous prime is 331726361. The next prime is 331726427. The reversal of 331726397 is 793627133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230402041 + 101324356 = 15179^2 + 10066^2 .

It is a cyclic number.

It is not a de Polignac number, because 331726397 - 2⁶ = 331726333 is a prime.

It is a super-2 number, since 2×331726397² = 220084804933203218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331720397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165863198 + 165863199.

It is an arithmetic number, because the mean of its divisors is an integer number (165863199).

Almost surely, 2^331726397 is an apocalyptic number.

It is an amenable number.

331726397 is a deficient number, since it is larger than the sum of its proper divisors (1).

331726397 is an equidigital number, since it uses as much as digits as its factorization.

331726397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884, while the sum is 41.

The square root of 331726397 is about 18213.3576531072. The cubic root of 331726397 is about 692.2452916879.

The spelling of 331726397 in words is "three hundred thirty-one million, seven hundred twenty-six thousand, three hundred ninety-seven".