251250161 has 8 divisors (see below), whose sum is σ = 257372544. Its totient is φ = 245140560.

The previous prime is 251250151. The next prime is 251250163. The reversal of 251250161 is 161052152.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251250161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (251250163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45416 + ... + 50646.

It is an arithmetic number, because the mean of its divisors is an integer number (32171568).

Almost surely, 2^251250161 is an apocalyptic number.

It is an amenable number.

251250161 is a deficient number, since it is larger than the sum of its proper divisors (6122383).

251250161 is a wasteful number, since it uses less digits than its factorization.

251250161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6391.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 251250161 is about 15850.8725627329. The cubic root of 251250161 is about 631.0088488926.

The spelling of 251250161 in words is "two hundred fifty-one million, two hundred fifty thousand, one hundred sixty-one".