642141637 has 4 divisors (see below), whose sum is σ = 642305356. Its totient is φ = 641977920.

The previous prime is 642141607. The next prime is 642141641. The reversal of 642141637 is 736141246.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13586596 + 628555041 = 3686^2 + 25071^2 .

It is a cyclic number.

It is not a de Polignac number, because 642141637 - 2⁷ = 642141509 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 (642141607) 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, 75828 + ... + 83869.

It is an arithmetic number, because the mean of its divisors is an integer number (160576339).

Almost surely, 2^642141637 is an apocalyptic number.

It is an amenable number.

642141637 is a deficient number, since it is larger than the sum of its proper divisors (163719).

642141637 is a wasteful number, since it uses less digits than its factorization.

642141637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163718.

The product of its digits is 24192, while the sum is 34.

The square root of 642141637 is about 25340.5137477518. The cubic root of 642141637 is about 862.7340593362.

The spelling of 642141637 in words is "six hundred forty-two million, one hundred forty-one thousand, six hundred thirty-seven".