642598279 has 2 divisors, whose sum is σ = 642598280. Its totient is φ = 642598278.

The previous prime is 642598267. The next prime is 642598291. The reversal of 642598279 is 972895246.

It is a balanced prime because it is at equal distance from previous prime (642598267) and next prime (642598291).

It is a cyclic number.

It is not a de Polignac number, because 642598279 - 2⁵ = 642598247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642598379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321299139 + 321299140.

It is an arithmetic number, because the mean of its divisors is an integer number (321299140).

Almost surely, 2^642598279 is an apocalyptic number.

642598279 is a deficient number, since it is larger than the sum of its proper divisors (1).

642598279 is an equidigital number, since it uses as much as digits as its factorization.

642598279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 52.

The square root of 642598279 is about 25349.5222637430. The cubic root of 642598279 is about 862.9385143638.

The spelling of 642598279 in words is "six hundred forty-two million, five hundred ninety-eight thousand, two hundred seventy-nine".