391936361 has 2 divisors, whose sum is σ = 391936362. Its totient is φ = 391936360.

The previous prime is 391936297. The next prime is 391936367. The reversal of 391936361 is 163639193.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205750336 + 186186025 = 14344^2 + 13645^2 .

It is a cyclic number.

It is not a de Polignac number, because 391936361 - 2⁶ = 391936297 is a prime.

It is a super-2 number, since 2×391936361² = 307228222147844642, 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 (391936367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195968180 + 195968181.

It is an arithmetic number, because the mean of its divisors is an integer number (195968181).

Almost surely, 2^391936361 is an apocalyptic number.

It is an amenable number.

391936361 is a deficient number, since it is larger than the sum of its proper divisors (1).

391936361 is an equidigital number, since it uses as much as digits as its factorization.

391936361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78732, while the sum is 41.

The square root of 391936361 is about 19797.3826805464. The cubic root of 391936361 is about 731.8215353449.

It can be divided in two parts, 39193 and 6361, that added together give a palindrome (45554).

The spelling of 391936361 in words is "three hundred ninety-one million, nine hundred thirty-six thousand, three hundred sixty-one".