251425001 has 4 divisors (see below), whose sum is σ = 251457492. Its totient is φ = 251392512.

The previous prime is 251424991. The next prime is 251425021. The reversal of 251425001 is 100524152.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 188238400 + 63186601 = 13720^2 + 7949^2 .

It is a cyclic number.

It is not a de Polignac number, because 251425001 - 2²⁶ = 184316137 is a prime.

It is a super-2 number, since 2×251425001² = 126429062255700002, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (251425021) 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, 2825 + ... + 22601.

It is an arithmetic number, because the mean of its divisors is an integer number (62864373).

Almost surely, 2^251425001 is an apocalyptic number.

It is an amenable number.

251425001 is a deficient number, since it is larger than the sum of its proper divisors (32491).

251425001 is a wasteful number, since it uses less digits than its factorization.

251425001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32490.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 251425001 is about 15856.3867573921. The cubic root of 251425001 is about 631.1551837984.

Adding to 251425001 its reverse (100524152), we get a palindrome (351949153).

The spelling of 251425001 in words is "two hundred fifty-one million, four hundred twenty-five thousand, one".