251401 has 4 divisors (see below), whose sum is σ = 260100. Its totient is φ = 242704.

The previous prime is 251393. The next prime is 251417. The reversal of 251401 is 104152.

251401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 121801 + 129600 = 349^2 + 360^2 .

It is a cyclic number.

It is not a de Polignac number, because 251401 - 2³ = 251393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251431) 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, 4306 + ... + 4363.

It is an arithmetic number, because the mean of its divisors is an integer number (65025).

2²⁵¹⁴⁰¹ is an apocalyptic number.

It is an amenable number.

251401 is a deficient number, since it is larger than the sum of its proper divisors (8699).

251401 is an equidigital number, since it uses as much as digits as its factorization.

251401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8698.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 251401 is about 501.3990426796. The cubic root of 251401 is about 63.1135099827.

Adding to 251401 its reverse (104152), we get a palindrome (355553).

The spelling of 251401 in words is "two hundred fifty-one thousand, four hundred one".