391914401 has 2 divisors, whose sum is σ = 391914402. Its totient is φ = 391914400.

The previous prime is 391914377. The next prime is 391914409. The reversal of 391914401 is 104419193.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 295874401 + 96040000 = 17201^2 + 9800^2 .

It is a cyclic number.

It is not a de Polignac number, because 391914401 - 2⁶ = 391914337 is a prime.

It is a super-2 number, since 2×391914401² = 307193795422377602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (391914409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195957200 + 195957201.

It is an arithmetic number, because the mean of its divisors is an integer number (195957201).

Almost surely, 2^391914401 is an apocalyptic number.

It is an amenable number.

391914401 is a deficient number, since it is larger than the sum of its proper divisors (1).

391914401 is an equidigital number, since it uses as much as digits as its factorization.

391914401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 391914401 is about 19796.8280540091. The cubic root of 391914401 is about 731.8078672237.

The spelling of 391914401 in words is "three hundred ninety-one million, nine hundred fourteen thousand, four hundred one".