642950983 has 4 divisors (see below), whose sum is σ = 643936248. Its totient is φ = 641965720.

The previous prime is 642950981. The next prime is 642950989. The reversal of 642950983 is 389059246.

642950983 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642950983 - 2¹ = 642950981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642950981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 491653 + ... + 492958.

It is an arithmetic number, because the mean of its divisors is an integer number (160984062).

Almost surely, 2^642950983 is an apocalyptic number.

642950983 is a deficient number, since it is larger than the sum of its proper divisors (985265).

642950983 is an equidigital number, since it uses as much as digits as its factorization.

642950983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985264.

The product of its (nonzero) digits is 466560, while the sum is 46.

The square root of 642950983 is about 25356.4781269008. The cubic root of 642950983 is about 863.0963663259.

The spelling of 642950983 in words is "six hundred forty-two million, nine hundred fifty thousand, nine hundred eighty-three".