641390699 has 2 divisors, whose sum is σ = 641390700. Its totient is φ = 641390698.

The previous prime is 641390681. The next prime is 641390723. The reversal of 641390699 is 996093146.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641390699 is a prime.

It is a super-2 number, since 2×641390699² = 822764057527417202, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (641390609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320695349 + 320695350.

It is an arithmetic number, because the mean of its divisors is an integer number (320695350).

Almost surely, 2^641390699 is an apocalyptic number.

641390699 is a deficient number, since it is larger than the sum of its proper divisors (1).

641390699 is an equidigital number, since it uses as much as digits as its factorization.

641390699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 641390699 is about 25325.6924683216. The cubic root of 641390699 is about 862.3976265527.

The spelling of 641390699 in words is "six hundred forty-one million, three hundred ninety thousand, six hundred ninety-nine".