642030561 has 12 divisors (see below), whose sum is σ = 930307092. Its totient is φ = 426668256.

The previous prime is 642030541. The next prime is 642030629. The reversal of 642030561 is 165030246.

It can be written as a sum of positive squares in 2 ways, for example, as 371756961 + 270273600 = 19281^2 + 16440^2 .

It is not a de Polignac number, because 642030561 - 2⁹ = 642030049 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (642030541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109666 + ... + 115371.

It is an arithmetic number, because the mean of its divisors is an integer number (77525591).

Almost surely, 2^642030561 is an apocalyptic number.

It is an amenable number.

642030561 is a deficient number, since it is larger than the sum of its proper divisors (288276531).

642030561 is a wasteful number, since it uses less digits than its factorization.

642030561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225360 (or 225357 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 642030561 is about 25338.3219846935. The cubic root of 642030561 is about 862.6843119654.

It can be divided in two parts, 64 and 2030561, that added together give a square (2030625 = 1425²).

The spelling of 642030561 in words is "six hundred forty-two million, thirty thousand, five hundred sixty-one".