250644561 has 16 divisors (see below), whose sum is σ = 359270400. Its totient is φ = 154932048.

The previous prime is 250644557. The next prime is 250644577. The reversal of 250644561 is 165446052.

It is not a de Polignac number, because 250644561 - 2² = 250644557 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (250644061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44101 + ... + 49458.

It is an arithmetic number, because the mean of its divisors is an integer number (22454400).

Almost surely, 2^250644561 is an apocalyptic number.

It is an amenable number.

250644561 is a deficient number, since it is larger than the sum of its proper divisors (108625839).

250644561 is a wasteful number, since it uses less digits than its factorization.

250644561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93628.

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 250644561 is about 15831.7579882968. The cubic root of 250644561 is about 630.5014576425.

The spelling of 250644561 in words is "two hundred fifty million, six hundred forty-four thousand, five hundred sixty-one".