399197568149 has 2 divisors, whose sum is σ = 399197568150. Its totient is φ = 399197568148.

The previous prime is 399197568139. The next prime is 399197568157. The reversal of 399197568149 is 941865791993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 358693188100 + 40504380049 = 598910^2 + 201257^2 .

It is a cyclic number.

It is not a de Polignac number, because 399197568149 - 2⁸ = 399197567893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399197568109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199598784074 + 199598784075.

It is an arithmetic number, because the mean of its divisors is an integer number (199598784075).

Almost surely, 2^399197568149 is an apocalyptic number.

It is an amenable number.

399197568149 is a deficient number, since it is larger than the sum of its proper divisors (1).

399197568149 is an equidigital number, since it uses as much as digits as its factorization.

399197568149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 132269760, while the sum is 71.

The spelling of 399197568149 in words is "three hundred ninety-nine billion, one hundred ninety-seven million, five hundred sixty-eight thousand, one hundred forty-nine".