251048401 has 4 divisors (see below), whose sum is σ = 265815972. Its totient is φ = 236280832.

The previous prime is 251048383. The next prime is 251048407. The reversal of 251048401 is 104840152.

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

It can be written as a sum of positive squares in 2 ways, for example, as 210395025 + 40653376 = 14505^2 + 6376^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251048401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251048407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7383760 + ... + 7383793.

It is an arithmetic number, because the mean of its divisors is an integer number (66453993).

Almost surely, 2^251048401 is an apocalyptic number.

It is an amenable number.

251048401 is a deficient number, since it is larger than the sum of its proper divisors (14767571).

251048401 is a wasteful number, since it uses less digits than its factorization.

251048401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14767570.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 251048401 is about 15844.5069661381. The cubic root of 251048401 is about 630.8398985015.

Adding to 251048401 its reverse (104840152), we get a palindrome (355888553).

The spelling of 251048401 in words is "two hundred fifty-one million, forty-eight thousand, four hundred one".