642235519 has 2 divisors, whose sum is σ = 642235520. Its totient is φ = 642235518.

The previous prime is 642235501. The next prime is 642235523. The reversal of 642235519 is 915532246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642235519 - 2¹⁵ = 642202751 is a prime.

It is a super-2 number, since 2×642235519² = 824932923730398722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642235019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321117759 + 321117760.

It is an arithmetic number, because the mean of its divisors is an integer number (321117760).

Almost surely, 2^642235519 is an apocalyptic number.

642235519 is a deficient number, since it is larger than the sum of its proper divisors (1).

642235519 is an equidigital number, since it uses as much as digits as its factorization.

642235519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 37.

The square root of 642235519 is about 25342.3660892191. The cubic root of 642235519 is about 862.7761015936.

The spelling of 642235519 in words is "six hundred forty-two million, two hundred thirty-five thousand, five hundred nineteen".