642013361 has 4 divisors (see below), whose sum is σ = 700378224. Its totient is φ = 583648500.

The previous prime is 642013343. The next prime is 642013367. The reversal of 642013361 is 163310246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642013361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 642013361.

It is not an unprimeable number, because it can be changed into a prime (642013367) 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, 29182415 + ... + 29182436.

It is an arithmetic number, because the mean of its divisors is an integer number (175094556).

Almost surely, 2^642013361 is an apocalyptic number.

It is an amenable number.

642013361 is a deficient number, since it is larger than the sum of its proper divisors (58364863).

642013361 is a wasteful number, since it uses less digits than its factorization.

642013361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58364862.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 642013361 is about 25337.9825755722. The cubic root of 642013361 is about 862.6766081251.

The spelling of 642013361 in words is "six hundred forty-two million, thirteen thousand, three hundred sixty-one".