642251199 has 8 divisors (see below), whose sum is σ = 857821360. Its totient is φ = 427424256.

The previous prime is 642251179. The next prime is 642251209. The reversal of 642251199 is 991152246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 642251199 - 2⁸ = 642250943 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 (642251179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183784 + ... + 187245.

It is an arithmetic number, because the mean of its divisors is an integer number (107227670).

Almost surely, 2^642251199 is an apocalyptic number.

642251199 is a deficient number, since it is larger than the sum of its proper divisors (215570161).

642251199 is a wasteful number, since it uses less digits than its factorization.

642251199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371609.

The product of its digits is 38880, while the sum is 39.

The square root of 642251199 is about 25342.6754507096. The cubic root of 642251199 is about 862.7831230153.

The spelling of 642251199 in words is "six hundred forty-two million, two hundred fifty-one thousand, one hundred ninety-nine".