391962997 has 2 divisors, whose sum is σ = 391962998. Its totient is φ = 391962996.

The previous prime is 391962979. The next prime is 391963001. The reversal of 391962997 is 799269193.

Together with previous prime (391962979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 349465636 + 42497361 = 18694^2 + 6519^2 .

It is a cyclic number.

It is not a de Polignac number, because 391962997 - 2¹⁹ = 391438709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391962097) 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, 195981498 + 195981499.

It is an arithmetic number, because the mean of its divisors is an integer number (195981499).

Almost surely, 2^391962997 is an apocalyptic number.

It is an amenable number.

391962997 is a deficient number, since it is larger than the sum of its proper divisors (1).

391962997 is an equidigital number, since it uses as much as digits as its factorization.

391962997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1653372, while the sum is 55.

The square root of 391962997 is about 19798.0553843048. The cubic root of 391962997 is about 731.8381131696.

The spelling of 391962997 in words is "three hundred ninety-one million, nine hundred sixty-two thousand, nine hundred ninety-seven".