642256341 has 4 divisors (see below), whose sum is σ = 856341792. Its totient is φ = 428170892.

The previous prime is 642256337. The next prime is 642256369. The reversal of 642256341 is 143652246.

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 not a de Polignac number, because 642256341 - 2² = 642256337 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642252341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107042721 + ... + 107042726.

It is an arithmetic number, because the mean of its divisors is an integer number (214085448).

Almost surely, 2^642256341 is an apocalyptic number.

It is an amenable number.

642256341 is a deficient number, since it is larger than the sum of its proper divisors (214085451).

642256341 is a wasteful number, since it uses less digits than its factorization.

642256341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214085450.

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

The square root of 642256341 is about 25342.7768999374. The cubic root of 642256341 is about 862.7854255510.

The spelling of 642256341 in words is "six hundred forty-two million, two hundred fifty-six thousand, three hundred forty-one".