1251430887 has 16 divisors (see below), whose sum is σ = 1939265280. Its totient is φ = 702982272.

The previous prime is 1251430879. The next prime is 1251430889. The reversal of 1251430887 is 7880341521.

It is not a de Polignac number, because 1251430887 - 2³ = 1251430879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251430889) 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 15 ways as a sum of consecutive naturals, for example, 503778 + ... + 506255.

It is an arithmetic number, because the mean of its divisors is an integer number (121204080).

Almost surely, 2^1251430887 is an apocalyptic number.

1251430887 is a deficient number, since it is larger than the sum of its proper divisors (687834393).

1251430887 is a wasteful number, since it uses less digits than its factorization.

1251430887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010102.

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 1251430887 is about 35375.5690696277. The cubic root of 1251430887 is about 1077.6282219562.

The spelling of 1251430887 in words is "one billion, two hundred fifty-one million, four hundred thirty thousand, eight hundred eighty-seven".