442102561 has 4 divisors (see below), whose sum is σ = 468108612. Its totient is φ = 416096512.

The previous prime is 442102547. The next prime is 442102567. The reversal of 442102561 is 165201244.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 158382225 + 283720336 = 12585^2 + 16844^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442102561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442102567) 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, 13003000 + ... + 13003033.

It is an arithmetic number, because the mean of its divisors is an integer number (117027153).

Almost surely, 2^442102561 is an apocalyptic number.

It is an amenable number.

442102561 is a deficient number, since it is larger than the sum of its proper divisors (26006051).

442102561 is a wasteful number, since it uses less digits than its factorization.

442102561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26006050.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 442102561 is about 21026.2350647946. The cubic root of 442102561 is about 761.8000735018.

The spelling of 442102561 in words is "four hundred forty-two million, one hundred two thousand, five hundred sixty-one".