642901 has 8 divisors (see below), whose sum is σ = 760320. Its totient is φ = 531888.

The previous prime is 642899. The next prime is 642907. The reversal of 642901 is 109246.

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

It is not a de Polignac number, because 642901 - 2¹ = 642899 is a prime.

It is a Duffinian number.

642901 is a lucky number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642907) 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, 1381 + ... + 1786.

It is an arithmetic number, because the mean of its divisors is an integer number (95040).

2⁶⁴²⁹⁰¹ is an apocalyptic number.

It is an amenable number.

642901 is a deficient number, since it is larger than the sum of its proper divisors (117419).

642901 is a wasteful number, since it uses less digits than its factorization.

642901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3203.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 642901 is about 801.8110750046. The cubic root of 642901 is about 86.3074000047.

The spelling of 642901 in words is "six hundred forty-two thousand, nine hundred one".