251045065 has 4 divisors (see below), whose sum is σ = 301254084. Its totient is φ = 200836048.

The previous prime is 251045033. The next prime is 251045087. The reversal of 251045065 is 560540152.

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

It can be written as a sum of positive squares in 2 ways, for example, as 194072761 + 56972304 = 13931^2 + 7548^2 .

It is a cyclic number.

It is not a de Polignac number, because 251045065 - 2⁵ = 251045033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25104502 + ... + 25104511.

It is an arithmetic number, because the mean of its divisors is an integer number (75313521).

Almost surely, 2^251045065 is an apocalyptic number.

It is an amenable number.

251045065 is a deficient number, since it is larger than the sum of its proper divisors (50209019).

251045065 is an equidigital number, since it uses as much as digits as its factorization.

251045065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50209018.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 251045065 is about 15844.4016927115. The cubic root of 251045065 is about 630.8371042313.

The spelling of 251045065 in words is "two hundred fifty-one million, forty-five thousand, sixty-five".