2187876961 has 8 divisors (see below), whose sum is σ = 2309415200. Its totient is φ = 2072719044.

The previous prime is 2187876919. The next prime is 2187876979. The reversal of 2187876961 is 1696787812.

It is not a de Polignac number, because 2187876961 - 2¹⁵ = 2187844193 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2187876991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152631 + ... + 166348.

It is an arithmetic number, because the mean of its divisors is an integer number (288676900).

Almost surely, 2^2187876961 is an apocalyptic number.

It is an amenable number.

2187876961 is a deficient number, since it is larger than the sum of its proper divisors (121538239).

2187876961 is an frugal number, since it uses more digits than its factorization.

2187876961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319036 (or 318998 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 55.

The square root of 2187876961 is about 46774.7470436773. The cubic root of 2187876961 is about 1298.1980875712.

The spelling of 2187876961 in words is "two billion, one hundred eighty-seven million, eight hundred seventy-six thousand, nine hundred sixty-one".