642491535 has 16 divisors (see below), whose sum is σ = 1174841856. Its totient is φ = 293710368.

The previous prime is 642491527. The next prime is 642491639. The reversal of 642491535 is 535194246.

642491535 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 642491535 - 2³ = 642491527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642491493 and 642491502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3059379 + ... + 3059588.

It is an arithmetic number, because the mean of its divisors is an integer number (73427616).

Almost surely, 2^642491535 is an apocalyptic number.

642491535 is a deficient number, since it is larger than the sum of its proper divisors (532350321).

642491535 is a wasteful number, since it uses less digits than its factorization.

642491535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6118982.

The product of its digits is 129600, while the sum is 39.

The square root of 642491535 is about 25347.4167322826. The cubic root of 642491535 is about 862.8907299170.

The spelling of 642491535 in words is "six hundred forty-two million, four hundred ninety-one thousand, five hundred thirty-five".