442042531 has 4 divisors (see below), whose sum is σ = 505191472. Its totient is φ = 378893592.

The previous prime is 442042529. The next prime is 442042541. The reversal of 442042531 is 135240244.

It is a happy number.

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

It is not a de Polignac number, because 442042531 - 2¹ = 442042529 is a prime.

It is a super-2 number, since 2×442042531² = 390803198425771922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 442042496 and 442042505.

It is not an unprimeable number, because it can be changed into a prime (442042541) 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, 31574460 + ... + 31574473.

It is an arithmetic number, because the mean of its divisors is an integer number (126297868).

Almost surely, 2^442042531 is an apocalyptic number.

442042531 is a deficient number, since it is larger than the sum of its proper divisors (63148941).

442042531 is an equidigital number, since it uses as much as digits as its factorization.

442042531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63148940.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 442042531 is about 21024.8075139821. The cubic root of 442042531 is about 761.7655921149.

Adding to 442042531 its reverse (135240244), we get a palindrome (577282775).

The spelling of 442042531 in words is "four hundred forty-two million, forty-two thousand, five hundred thirty-one".