391496081 has 2 divisors, whose sum is σ = 391496082. Its totient is φ = 391496080.

The previous prime is 391496057. The next prime is 391496173. The reversal of 391496081 is 180694193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 344436481 + 47059600 = 18559^2 + 6860^2 .

It is a cyclic number.

It is not a de Polignac number, because 391496081 - 2²² = 387301777 is a prime.

It is a super-2 number, since 2×391496081² = 306538362876717122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (391496681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195748040 + 195748041.

It is an arithmetic number, because the mean of its divisors is an integer number (195748041).

Almost surely, 2^391496081 is an apocalyptic number.

It is an amenable number.

391496081 is a deficient number, since it is larger than the sum of its proper divisors (1).

391496081 is an equidigital number, since it uses as much as digits as its factorization.

391496081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 391496081 is about 19786.2599042871. The cubic root of 391496081 is about 731.5474031619.

The spelling of 391496081 in words is "three hundred ninety-one million, four hundred ninety-six thousand, eighty-one".