336915721 has 2 divisors, whose sum is σ = 336915722. Its totient is φ = 336915720.

The previous prime is 336915713. The next prime is 336915751. The reversal of 336915721 is 127519633.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 329967225 + 6948496 = 18165^2 + 2636^2 .

It is a cyclic number.

It is not a de Polignac number, because 336915721 - 2³ = 336915713 is a prime.

It is a super-2 number, since 2×336915721² = 227024406113899682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (336915701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 168457860 + 168457861.

It is an arithmetic number, because the mean of its divisors is an integer number (168457861).

Almost surely, 2^336915721 is an apocalyptic number.

It is an amenable number.

336915721 is a deficient number, since it is larger than the sum of its proper divisors (1).

336915721 is an equidigital number, since it uses as much as digits as its factorization.

336915721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34020, while the sum is 37.

The square root of 336915721 is about 18355.2641223165. The cubic root of 336915721 is about 695.8363177262.

The spelling of 336915721 in words is "three hundred thirty-six million, nine hundred fifteen thousand, seven hundred twenty-one".