396091261 has 2 divisors, whose sum is σ = 396091262. Its totient is φ = 396091260.

The previous prime is 396091237. The next prime is 396091301. The reversal of 396091261 is 162190693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236852100 + 159239161 = 15390^2 + 12619^2 .

It is a cyclic number.

It is not a de Polignac number, because 396091261 - 2⁵ = 396091229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 396091261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (396791261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198045630 + 198045631.

It is an arithmetic number, because the mean of its divisors is an integer number (198045631).

Almost surely, 2^396091261 is an apocalyptic number.

It is an amenable number.

396091261 is a deficient number, since it is larger than the sum of its proper divisors (1).

396091261 is an equidigital number, since it uses as much as digits as its factorization.

396091261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 396091261 is about 19902.0416289385. The cubic root of 396091261 is about 734.3984533110.

The spelling of 396091261 in words is "three hundred ninety-six million, ninety-one thousand, two hundred sixty-one".