642992111 has 8 divisors (see below), whose sum is σ = 664118400. Its totient is φ = 621889920.

The previous prime is 642992039. The next prime is 642992113. The reversal of 642992111 is 111299246.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642992111 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 (642992113) 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, 59795 + ... + 69723.

It is an arithmetic number, because the mean of its divisors is an integer number (83014800).

Almost surely, 2^642992111 is an apocalyptic number.

642992111 is a deficient number, since it is larger than the sum of its proper divisors (21126289).

642992111 is a wasteful number, since it uses less digits than its factorization.

642992111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12049.

The product of its digits is 7776, while the sum is 35.

The square root of 642992111 is about 25357.2891098398. The cubic root of 642992111 is about 863.1147693205.

The spelling of 642992111 in words is "six hundred forty-two million, nine hundred ninety-two thousand, one hundred eleven".