2115187361 has 10 divisors (see below), whose sum is σ = 2467574562. Its totient is φ = 1813015680.

The previous prime is 2115187309. The next prime is 2115187363. The reversal of 2115187361 is 1637815112.

It can be written as a sum of positive squares in only one way, i.e., 1759299136 + 355888225 = 41944^2 + 18865^2 .

It is not a de Polignac number, because 2115187361 - 2²² = 2110993057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2115187363) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 438080 + ... + 442881.

Almost surely, 2^2115187361 is an apocalyptic number.

It is an amenable number.

2115187361 is a deficient number, since it is larger than the sum of its proper divisors (352387201).

2115187361 is an frugal number, since it uses more digits than its factorization.

2115187361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880989 (or 880968 counting only the distinct ones).

The product of its digits is 10080, while the sum is 35.

The square root of 2115187361 is about 45991.1661191581. The cubic root of 2115187361 is about 1283.6588349726.

The spelling of 2115187361 in words is "two billion, one hundred fifteen million, one hundred eighty-seven thousand, three hundred sixty-one".