1251116001 has 6 divisors (see below), whose sum is σ = 1807167570. Its totient is φ = 834077328.

The previous prime is 1251115997. The next prime is 1251116017. The reversal of 1251116001 is 1006111521.

It is a happy number.

1251116001 is a `hidden beast` number, since 1 + 2 + 51 + 11 + 600 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 918090000 + 333026001 = 30300^2 + 18249^2 .

It is not a de Polignac number, because 1251116001 - 2² = 1251115997 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1251116051) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 69506436 + ... + 69506453.

It is an arithmetic number, because the mean of its divisors is an integer number (301194595).

Almost surely, 2^1251116001 is an apocalyptic number.

It is an amenable number.

1251116001 is a deficient number, since it is larger than the sum of its proper divisors (556051569).

1251116001 is a wasteful number, since it uses less digits than its factorization.

1251116001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139012895 (or 139012892 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 18.

The square root of 1251116001 is about 35371.1181757094. The cubic root of 1251116001 is about 1077.5378298276.

Adding to 1251116001 its reverse (1006111521), we get a palindrome (2257227522).

The spelling of 1251116001 in words is "one billion, two hundred fifty-one million, one hundred sixteen thousand, one".