1251861486 has 16 divisors (see below), whose sum is σ = 2514114768. Its totient is φ = 415555200.

The previous prime is 1251861467. The next prime is 1251861491. The reversal of 1251861486 is 6841681521.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 431425 + ... + 434316.

It is an arithmetic number, because the mean of its divisors is an integer number (157132173).

Almost surely, 2^1251861486 is an apocalyptic number.

1251861486 is an abundant number, since it is smaller than the sum of its proper divisors (1262253282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1251861486 is a wasteful number, since it uses less digits than its factorization.

1251861486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865987.

The product of its digits is 92160, while the sum is 42.

The square root of 1251861486 is about 35381.6546532239. The cubic root of 1251861486 is about 1077.7518064675.

The spelling of 1251861486 in words is "one billion, two hundred fifty-one million, eight hundred sixty-one thousand, four hundred eighty-six".