641999079 has 12 divisors (see below), whose sum is σ = 927615000. Its totient is φ = 427868784.

The previous prime is 641999077. The next prime is 641999081. The reversal of 641999079 is 970999146.

It is an interprime number because it is at equal distance from previous prime (641999077) and next prime (641999081).

It is not a de Polignac number, because 641999079 - 2¹ = 641999077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641999077) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27297 + ... + 45045.

It is an arithmetic number, because the mean of its divisors is an integer number (77301250).

Almost surely, 2^641999079 is an apocalyptic number.

641999079 is a deficient number, since it is larger than the sum of its proper divisors (285615921).

641999079 is a wasteful number, since it uses less digits than its factorization.

641999079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21774 (or 21771 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 54.

The square root of 641999079 is about 25337.7007441480. The cubic root of 641999079 is about 862.6702111458.

The spelling of 641999079 in words is "six hundred forty-one million, nine hundred ninety-nine thousand, seventy-nine".