6399374129 has 2 divisors, whose sum is σ = 6399374130. Its totient is φ = 6399374128.

The previous prime is 6399374101. The next prime is 6399374161. The reversal of 6399374129 is 9214739936.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6139035904 + 260338225 = 78352^2 + 16135^2 .

It is a cyclic number.

It is not a de Polignac number, because 6399374129 - 2¹⁶ = 6399308593 is a prime.

It is not a weakly prime, because it can be changed into another prime (6399371129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3199687064 + 3199687065.

It is an arithmetic number, because the mean of its divisors is an integer number (3199687065).

Almost surely, 2^6399374129 is an apocalyptic number.

It is an amenable number.

6399374129 is a deficient number, since it is larger than the sum of its proper divisors (1).

6399374129 is an equidigital number, since it uses as much as digits as its factorization.

6399374129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2204496, while the sum is 53.

The square root of 6399374129 is about 79996.0882106119. The cubic root of 6399374129 is about 1856.5750098921.

The spelling of 6399374129 in words is "six billion, three hundred ninety-nine million, three hundred seventy-four thousand, one hundred twenty-nine".