251442441 has 64 divisors (see below), whose sum is σ = 402796800. Its totient is φ = 154732032.

The previous prime is 251442431. The next prime is 251442449. The reversal of 251442441 is 144244152.

It is not a de Polignac number, because 251442441 - 2⁷ = 251442313 is a prime.

It is a super-2 number, since 2×251442441² = 126446602272076962, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (251442449) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3029386 + ... + 3029468.

It is an arithmetic number, because the mean of its divisors is an integer number (6293700).

Almost surely, 2^251442441 is an apocalyptic number.

It is an amenable number.

251442441 is a deficient number, since it is larger than the sum of its proper divisors (151354359).

251442441 is a wasteful number, since it uses less digits than its factorization.

251442441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 241 counting only the distinct ones).

The product of its digits is 5120, while the sum is 27.

The square root of 251442441 is about 15856.9366839879. The cubic root of 251442441 is about 631.1697767411.

Adding to 251442441 its reverse (144244152), we get a palindrome (395686593).

The spelling of 251442441 in words is "two hundred fifty-one million, four hundred forty-two thousand, four hundred forty-one".