251340065 has 8 divisors (see below), whose sum is σ = 301844328. Its totient is φ = 200914560.

The previous prime is 251340049. The next prime is 251340079. The reversal of 251340065 is 560043152.

It can be written as a sum of positive squares in 4 ways, for example, as 65399569 + 185940496 = 8087^2 + 13636^2 .

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

It is not a de Polignac number, because 251340065 - 2⁴ = 251340049 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12422 + ... + 25631.

It is an arithmetic number, because the mean of its divisors is an integer number (37730541).

Almost surely, 2^251340065 is an apocalyptic number.

It is an amenable number.

251340065 is a deficient number, since it is larger than the sum of its proper divisors (50504263).

251340065 is a wasteful number, since it uses less digits than its factorization.

251340065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39379.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 251340065 is about 15853.7082412917. The cubic root of 251340065 is about 631.0841038419.

The spelling of 251340065 in words is "two hundred fifty-one million, three hundred forty thousand, sixty-five".