2151268985 has 16 divisors (see below), whose sum is σ = 2654096016. Its totient is φ = 1672731648.

The previous prime is 2151268957. The next prime is 2151268991. The reversal of 2151268985 is 5898621512.

It can be written as a sum of positive squares in 8 ways, for example, as 786409849 + 1364859136 = 28043^2 + 36944^2 .

It is a cyclic number.

It is not a de Polignac number, because 2151268985 - 2¹⁰ = 2151267961 is a prime.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 185477 + ... + 196733.

It is an arithmetic number, because the mean of its divisors is an integer number (165881001).

Almost surely, 2^2151268985 is an apocalyptic number.

It is an amenable number.

2151268985 is a deficient number, since it is larger than the sum of its proper divisors (502827031).

2151268985 is a wasteful number, since it uses less digits than its factorization.

2151268985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12332.

The product of its digits is 345600, while the sum is 47.

The square root of 2151268985 is about 46381.7742761098. The cubic root of 2151268985 is about 1290.9167581486.

The spelling of 2151268985 in words is "two billion, one hundred fifty-one million, two hundred sixty-eight thousand, nine hundred eighty-five".