642849179 has 6 divisors (see below), whose sum is σ = 747804204. Its totient is φ = 551013540.

The previous prime is 642849133. The next prime is 642849197. The reversal of 642849179 is 971948246.

It is not a de Polignac number, because 642849179 - 2¹⁶ = 642783643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642849079) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6559637 + ... + 6559734.

It is an arithmetic number, because the mean of its divisors is an integer number (124634034).

Almost surely, 2^642849179 is an apocalyptic number.

642849179 is a deficient number, since it is larger than the sum of its proper divisors (104955025).

642849179 is a wasteful number, since it uses less digits than its factorization.

642849179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13119385 (or 13119378 counting only the distinct ones).

The product of its digits is 870912, while the sum is 50.

The square root of 642849179 is about 25354.4705919883. The cubic root of 642849179 is about 863.0508100793.

The spelling of 642849179 in words is "six hundred forty-two million, eight hundred forty-nine thousand, one hundred seventy-nine".