642654231 has 4 divisors (see below), whose sum is σ = 856872312. Its totient is φ = 428436152.

The previous prime is 642654217. The next prime is 642654241. The reversal of 642654231 is 132456246.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642654231 - 2⁹ = 642653719 is a prime.

It is a super-2 number, since 2×642654231² = 826008921244402722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 642654192 and 642654201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642654241) 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, 107109036 + ... + 107109041.

It is an arithmetic number, because the mean of its divisors is an integer number (214218078).

Almost surely, 2^642654231 is an apocalyptic number.

642654231 is a deficient number, since it is larger than the sum of its proper divisors (214218081).

642654231 is a wasteful number, since it uses less digits than its factorization.

642654231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214218080.

The product of its digits is 34560, while the sum is 33.

The square root of 642654231 is about 25350.6258502626. The cubic root of 642654231 is about 862.9635594223.

The spelling of 642654231 in words is "six hundred forty-two million, six hundred fifty-four thousand, two hundred thirty-one".