642511903 has 8 divisors (see below), whose sum is σ = 701136000. Its totient is φ = 583923480.

The previous prime is 642511871. The next prime is 642511913. The reversal of 642511903 is 309115246.

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

It is a cyclic number.

It is not a de Polignac number, because 642511903 - 2⁵ = 642511871 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 (642511913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40848 + ... + 54346.

It is an arithmetic number, because the mean of its divisors is an integer number (87642000).

Almost surely, 2^642511903 is an apocalyptic number.

642511903 is a deficient number, since it is larger than the sum of its proper divisors (58624097).

642511903 is a wasteful number, since it uses less digits than its factorization.

642511903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17837.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 642511903 is about 25347.8185057413. The cubic root of 642511903 is about 862.8998481553.

The spelling of 642511903 in words is "six hundred forty-two million, five hundred eleven thousand, nine hundred three".