1251162126 has 40 divisors (see below), whose sum is σ = 2812120344. Its totient is φ = 415776240.

The previous prime is 1251162113. The next prime is 1251162173. The reversal of 1251162126 is 6212611521.

1251162126 is a `hidden beast` number, since 1 + 2 + 5 + 11 + 621 + 26 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 1251162126.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 41956 + ... + 65288.

Almost surely, 2^1251162126 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1251162126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1406060172).

1251162126 is an abundant number, since it is smaller than the sum of its proper divisors (1560958218).

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

1251162126 is a wasteful number, since it uses less digits than its factorization.

1251162126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23678 (or 23669 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 1251162126 is about 35371.7701847109. The cubic root of 1251162126 is about 1077.5510715578.

Adding to 1251162126 its reverse (6212611521), we get a palindrome (7463773647).

The spelling of 1251162126 in words is "one billion, two hundred fifty-one million, one hundred sixty-two thousand, one hundred twenty-six".