442505431 has 2 divisors, whose sum is σ = 442505432. Its totient is φ = 442505430.

The previous prime is 442505387. The next prime is 442505467. The reversal of 442505431 is 134505244.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 442505431 - 2¹³ = 442497239 is a prime.

It is a super-2 number, since 2×442505431² = 391622112928991522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 442505431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442505471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221252715 + 221252716.

It is an arithmetic number, because the mean of its divisors is an integer number (221252716).

Almost surely, 2^442505431 is an apocalyptic number.

442505431 is a deficient number, since it is larger than the sum of its proper divisors (1).

442505431 is an equidigital number, since it uses as much as digits as its factorization.

442505431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 442505431 is about 21035.8130577356. The cubic root of 442505431 is about 762.0314023428.

The spelling of 442505431 in words is "four hundred forty-two million, five hundred five thousand, four hundred thirty-one".