251402241 has 8 divisors (see below), whose sum is σ = 335278944. Its totient is φ = 167563520.

The previous prime is 251402237. The next prime is 251402257. The reversal of 251402241 is 142204152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 251402241 - 2² = 251402237 is a prime.

It is not an unprimeable number, because it can be changed into a prime (251402441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14926 + ... + 26936.

It is an arithmetic number, because the mean of its divisors is an integer number (41909868).

Almost surely, 2^251402241 is an apocalyptic number.

It is an amenable number.

251402241 is a deficient number, since it is larger than the sum of its proper divisors (83876703).

251402241 is a wasteful number, since it uses less digits than its factorization.

251402241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18991.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 251402241 is about 15855.6690492707. The cubic root of 251402241 is about 631.1361383237.

Adding to 251402241 its reverse (142204152), we get a palindrome (393606393).

The spelling of 251402241 in words is "two hundred fifty-one million, four hundred two thousand, two hundred forty-one".