251328945 has 32 divisors (see below), whose sum is σ = 461590272. Its totient is φ = 114388992.

The previous prime is 251328943. The next prime is 251328947. The reversal of 251328945 is 549823152.

It is an interprime number because it is at equal distance from previous prime (251328943) and next prime (251328947).

It is not a de Polignac number, because 251328945 - 2¹ = 251328943 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (251328943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19329 + ... + 29601.

It is an arithmetic number, because the mean of its divisors is an integer number (14424696).

Almost surely, 2^251328945 is an apocalyptic number.

It is an amenable number.

251328945 is a deficient number, since it is larger than the sum of its proper divisors (210261327).

251328945 is a wasteful number, since it uses less digits than its factorization.

251328945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10521.

The product of its digits is 86400, while the sum is 39.

The square root of 251328945 is about 15853.3575308198. The cubic root of 251328945 is about 631.0747967188.

The spelling of 251328945 in words is "two hundred fifty-one million, three hundred twenty-eight thousand, nine hundred forty-five".