442531 has 2 divisors, whose sum is σ = 442532. Its totient is φ = 442530.

The previous prime is 442517. The next prime is 442537. The reversal of 442531 is 135244.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 442531 - 2⁵ = 442499 is a prime.

It is a super-2 number, since 2×442531² = 391667371922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 442499 and 442508.

It is not a weakly prime, because it can be changed into another prime (442537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221265 + 221266.

It is an arithmetic number, because the mean of its divisors is an integer number (221266).

2⁴⁴²⁵³¹ is an apocalyptic number.

442531 is the 298-th centered decagonal number.

442531 is a deficient number, since it is larger than the sum of its proper divisors (1).

442531 is an equidigital number, since it uses as much as digits as its factorization.

442531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 19.

The square root of 442531 is about 665.2300354013. The cubic root of 442531 is about 76.2046079380.

Adding to 442531 its reverse (135244), we get a palindrome (577775).

The spelling of 442531 in words is "four hundred forty-two thousand, five hundred thirty-one".