391393069 has 2 divisors, whose sum is σ = 391393070. Its totient is φ = 391393068.

The previous prime is 391393049. The next prime is 391393087. The reversal of 391393069 is 960393193.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 260015625 + 131377444 = 16125^2 + 11462^2 .

It is a cyclic number.

It is not a de Polignac number, because 391393069 - 2⁷ = 391392941 is a prime.

It is a super-2 number, since 2×391393069² = 306377068922477522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391393049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195696534 + 195696535.

It is an arithmetic number, because the mean of its divisors is an integer number (195696535).

Almost surely, 2^391393069 is an apocalyptic number.

It is an amenable number.

391393069 is a deficient number, since it is larger than the sum of its proper divisors (1).

391393069 is an equidigital number, since it uses as much as digits as its factorization.

391393069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 118098, while the sum is 43.

The square root of 391393069 is about 19783.6566134777. The cubic root of 391393069 is about 731.4832349831.

The spelling of 391393069 in words is "three hundred ninety-one million, three hundred ninety-three thousand, sixty-nine".