641390371 has 2 divisors, whose sum is σ = 641390372. Its totient is φ = 641390370.

The previous prime is 641390359. The next prime is 641390381. The reversal of 641390371 is 173093146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 641390371 - 2¹³ = 641382179 is a prime.

It is a super-2 number, since 2×641390371² = 822763216023035282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (641390381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320695185 + 320695186.

It is an arithmetic number, because the mean of its divisors is an integer number (320695186).

Almost surely, 2^641390371 is an apocalyptic number.

641390371 is a deficient number, since it is larger than the sum of its proper divisors (1).

641390371 is an equidigital number, since it uses as much as digits as its factorization.

641390371 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 641390371 is about 25325.6859926834. The cubic root of 641390371 is about 862.3974795459.

The spelling of 641390371 in words is "six hundred forty-one million, three hundred ninety thousand, three hundred seventy-one".