251340945 has 8 divisors (see below), whose sum is σ = 402145536. Its totient is φ = 134048496.

The previous prime is 251340931. The next prime is 251340953. The reversal of 251340945 is 549043152.

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

It is not a de Polignac number, because 251340945 - 2¹⁴ = 251324561 is a prime.

It is a super-3 number, since 3×251340945³ (a number of 26 digits) contains 333 as substring.

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, 8378017 + ... + 8378046.

It is an arithmetic number, because the mean of its divisors is an integer number (50268192).

Almost surely, 2^251340945 is an apocalyptic number.

It is an amenable number.

251340945 is a deficient number, since it is larger than the sum of its proper divisors (150804591).

251340945 is a wasteful number, since it uses less digits than its factorization.

251340945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16756071.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 251340945 is about 15853.7359950265. The cubic root of 251340945 is about 631.0848403651.

The spelling of 251340945 in words is "two hundred fifty-one million, three hundred forty thousand, nine hundred forty-five".