251298045 has 40 divisors (see below), whose sum is σ = 451830456. Its totient is φ = 133622784.

The previous prime is 251298041. The next prime is 251298053. The reversal of 251298045 is 540892152.

It can be written as a sum of positive squares in 4 ways, for example, as 19131876 + 232166169 = 4374^2 + 15237^2 .

It is not a de Polignac number, because 251298045 - 2² = 251298041 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251298041) 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 39 ways as a sum of consecutive naturals, for example, 174649 + ... + 176081.

Almost surely, 2^251298045 is an apocalyptic number.

It is an amenable number.

251298045 is a deficient number, since it is larger than the sum of its proper divisors (200532411).

251298045 is a wasteful number, since it uses less digits than its factorization.

251298045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1883 (or 1874 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 251298045 is about 15852.3829438984. The cubic root of 251298045 is about 631.0489328582.

The spelling of 251298045 in words is "two hundred fifty-one million, two hundred ninety-eight thousand, forty-five".