391656036997 has 2 divisors, whose sum is σ = 391656036998. Its totient is φ = 391656036996.

The previous prime is 391656036983. The next prime is 391656037013. The reversal of 391656036997 is 799630656193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 309668877441 + 81987159556 = 556479^2 + 286334^2 .

It is a cyclic number.

It is not a de Polignac number, because 391656036997 - 2¹⁹ = 391655512709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391656036197) 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, 195828018498 + 195828018499.

It is an arithmetic number, because the mean of its divisors is an integer number (195828018499).

Almost surely, 2^391656036997 is an apocalyptic number.

It is an amenable number.

391656036997 is a deficient number, since it is larger than the sum of its proper divisors (1).

391656036997 is an equidigital number, since it uses as much as digits as its factorization.

391656036997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49601160, while the sum is 64.

The spelling of 391656036997 in words is "three hundred ninety-one billion, six hundred fifty-six million, thirty-six thousand, nine hundred ninety-seven".