331997971 has 2 divisors, whose sum is σ = 331997972. Its totient is φ = 331997970.

The previous prime is 331997959. The next prime is 331998011. The reversal of 331997971 is 179799133.

It is a weak prime.

It is an emirp because it is prime and its reverse (179799133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 331997971 - 2⁷ = 331997843 is a prime.

It is a super-2 number, since 2×331997971² = 220445305496233682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (331997921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165998985 + 165998986.

It is an arithmetic number, because the mean of its divisors is an integer number (165998986).

Almost surely, 2^331997971 is an apocalyptic number.

331997971 is a deficient number, since it is larger than the sum of its proper divisors (1).

331997971 is an equidigital number, since it uses as much as digits as its factorization.

331997971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 321489, while the sum is 49.

The square root of 331997971 is about 18220.8114802826. The cubic root of 331997971 is about 692.4341466657.

The spelling of 331997971 in words is "three hundred thirty-one million, nine hundred ninety-seven thousand, nine hundred seventy-one".