442041581 has 4 divisors (see below), whose sum is σ = 442088352. Its totient is φ = 441994812.

The previous prime is 442041569. The next prime is 442041619. The reversal of 442041581 is 185140244.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 442041581 - 2²⁶ = 374932717 is a prime.

It is a super-2 number, since 2×442041581² = 390801518665959122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442041781) 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, 3665 + ... + 29958.

It is an arithmetic number, because the mean of its divisors is an integer number (110522088).

Almost surely, 2^442041581 is an apocalyptic number.

It is an amenable number.

442041581 is a deficient number, since it is larger than the sum of its proper divisors (46771).

442041581 is a wasteful number, since it uses less digits than its factorization.

442041581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46770.

The product of its (nonzero) digits is 5120, while the sum is 29.

The square root of 442041581 is about 21024.7849216110. The cubic root of 442041581 is about 761.7650464074.

The spelling of 442041581 in words is "four hundred forty-two million, forty-one thousand, five hundred eighty-one".