251366 has 4 divisors (see below), whose sum is σ = 377052. Its totient is φ = 125682.

The previous prime is 251359. The next prime is 251387. The reversal of 251366 is 663152.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62840 + ... + 62843.

It is an arithmetic number, because the mean of its divisors is an integer number (94263).

2²⁵¹³⁶⁶ is an apocalyptic number.

251366 is a deficient number, since it is larger than the sum of its proper divisors (125686).

251366 is a wasteful number, since it uses less digits than its factorization.

251366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125685.

The product of its digits is 1080, while the sum is 23.

The square root of 251366 is about 501.3641391244. The cubic root of 251366 is about 63.1105809631.

The spelling of 251366 in words is "two hundred fifty-one thousand, three hundred sixty-six".