642100539 has 4 divisors (see below), whose sum is σ = 856134056. Its totient is φ = 428067024.

The previous prime is 642100493. The next prime is 642100541. The reversal of 642100539 is 935001246.

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

It is not a de Polignac number, because 642100539 - 2⁷ = 642100411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642100559) 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, 107016754 + ... + 107016759.

It is an arithmetic number, because the mean of its divisors is an integer number (214033514).

Almost surely, 2^642100539 is an apocalyptic number.

642100539 is a deficient number, since it is larger than the sum of its proper divisors (214033517).

642100539 is a wasteful number, since it uses less digits than its factorization.

642100539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214033516.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 642100539 is about 25339.7028198833. The cubic root of 642100539 is about 862.7156535314.

The spelling of 642100539 in words is "six hundred forty-two million, one hundred thousand, five hundred thirty-nine".