442242251 has 4 divisors (see below), whose sum is σ = 482446104. Its totient is φ = 402038400.

The previous prime is 442242209. The next prime is 442242289. The reversal of 442242251 is 152242244.

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

It is a cyclic number.

It is not a de Polignac number, because 442242251 - 2²² = 438047947 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 442242251.

It is not an unprimeable number, because it can be changed into a prime (442242751) 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, 20101910 + ... + 20101931.

It is an arithmetic number, because the mean of its divisors is an integer number (120611526).

Almost surely, 2^442242251 is an apocalyptic number.

442242251 is a deficient number, since it is larger than the sum of its proper divisors (40203853).

442242251 is a wasteful number, since it uses less digits than its factorization.

442242251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40203852.

The product of its digits is 5120, while the sum is 26.

The square root of 442242251 is about 21029.5566049311. The cubic root of 442242251 is about 761.8802997175.

Adding to 442242251 its reverse (152242244), we get a palindrome (594484495).

The spelling of 442242251 in words is "four hundred forty-two million, two hundred forty-two thousand, two hundred fifty-one".