442142251 has 2 divisors, whose sum is σ = 442142252. Its totient is φ = 442142250.

The previous prime is 442142249. The next prime is 442142263. The reversal of 442142251 is 152241244.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 442142251 - 2¹ = 442142249 is a prime.

Together with 442142249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (442142231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221071125 + 221071126.

It is an arithmetic number, because the mean of its divisors is an integer number (221071126).

Almost surely, 2^442142251 is an apocalyptic number.

442142251 is a deficient number, since it is larger than the sum of its proper divisors (1).

442142251 is an equidigital number, since it uses as much as digits as its factorization.

442142251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2560, while the sum is 25.

The square root of 442142251 is about 21027.1788645077. The cubic root of 442142251 is about 761.8228698262.

Adding to 442142251 its reverse (152241244), we get a palindrome (594383495).

The spelling of 442142251 in words is "four hundred forty-two million, one hundred forty-two thousand, two hundred fifty-one".