442437691 has 2 divisors, whose sum is σ = 442437692. Its totient is φ = 442437690.

The previous prime is 442437689. The next prime is 442437713. The reversal of 442437691 is 196734244.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 442437691 - 2¹ = 442437689 is a prime.

It is a super-2 number, since 2×442437691² = 391502220834822962, which contains 22 as substring.

Together with 442437689, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (442437641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221218845 + 221218846.

It is an arithmetic number, because the mean of its divisors is an integer number (221218846).

Almost surely, 2^442437691 is an apocalyptic number.

442437691 is a deficient number, since it is larger than the sum of its proper divisors (1).

442437691 is an equidigital number, since it uses as much as digits as its factorization.

442437691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 40.

The square root of 442437691 is about 21034.2028848255. The cubic root of 442437691 is about 761.9925157078.

The spelling of 442437691 in words is "four hundred forty-two million, four hundred thirty-seven thousand, six hundred ninety-one".