642594331 has 2 divisors, whose sum is σ = 642594332. Its totient is φ = 642594330.

The previous prime is 642594317. The next prime is 642594341. The reversal of 642594331 is 133495246.

642594331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642594331 - 2⁵ = 642594299 is a prime.

It is a super-2 number, since 2×642594331² = 825854948466675122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (642594301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321297165 + 321297166.

It is an arithmetic number, because the mean of its divisors is an integer number (321297166).

Almost surely, 2^642594331 is an apocalyptic number.

642594331 is a deficient number, since it is larger than the sum of its proper divisors (1).

642594331 is an equidigital number, since it uses as much as digits as its factorization.

642594331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 37.

The square root of 642594331 is about 25349.4443923333. Note that the first 3 decimals coincide. The cubic root of 642594331 is about 862.9367471175.

The spelling of 642594331 in words is "six hundred forty-two million, five hundred ninety-four thousand, three hundred thirty-one".