250115561 has 4 divisors (see below), whose sum is σ = 250166400. Its totient is φ = 250064724.

The previous prime is 250115519. The next prime is 250115581. The reversal of 250115561 is 165511052.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 250115561 - 2⁶ = 250115497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 250115561.

It is not an unprimeable number, because it can be changed into a prime (250115581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17141 + ... + 28178.

It is an arithmetic number, because the mean of its divisors is an integer number (62541600).

Almost surely, 2^250115561 is an apocalyptic number.

It is an amenable number.

250115561 is a deficient number, since it is larger than the sum of its proper divisors (50839).

250115561 is an equidigital number, since it uses as much as digits as its factorization.

250115561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50838.

The product of its (nonzero) digits is 1500, while the sum is 26.

The square root of 250115561 is about 15815.0422383249. The cubic root of 250115561 is about 630.0575751530.

The spelling of 250115561 in words is "two hundred fifty million, one hundred fifteen thousand, five hundred sixty-one".