2145615187 has 4 divisors (see below), whose sum is σ = 2165299840. Its totient is φ = 2125930536.

The previous prime is 2145615167. The next prime is 2145615193. The reversal of 2145615187 is 7815165412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2145615187 - 2¹¹ = 2145613139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145615107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9842163 + ... + 9842380.

It is an arithmetic number, because the mean of its divisors is an integer number (541324960).

Almost surely, 2^2145615187 is an apocalyptic number.

2145615187 is a deficient number, since it is larger than the sum of its proper divisors (19684653).

2145615187 is a wasteful number, since it uses less digits than its factorization.

2145615187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19684652.

The product of its digits is 67200, while the sum is 40.

The square root of 2145615187 is about 46320.7856906594. The cubic root of 2145615187 is about 1289.7848702809.

The spelling of 2145615187 in words is "two billion, one hundred forty-five million, six hundred fifteen thousand, one hundred eighty-seven".