251701 has 2 divisors, whose sum is σ = 251702. Its totient is φ = 251700.

The previous prime is 251677. The next prime is 251707. The reversal of 251701 is 107152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181476 + 70225 = 426^2 + 265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125850 + 125851.

It is an arithmetic number, because the mean of its divisors is an integer number (125851).

2²⁵¹⁷⁰¹ is an apocalyptic number.

It is an amenable number.

251701 is a deficient number, since it is larger than the sum of its proper divisors (1).

251701 is an equidigital number, since it uses as much as digits as its factorization.

251701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 251701 is about 501.6981164007. The cubic root of 251701 is about 63.1386047205.

Adding to 251701 its reverse (107152), we get a palindrome (358853).

The spelling of 251701 in words is "two hundred fifty-one thousand, seven hundred one".