2181958287 has 16 divisors (see below), whose sum is σ = 2919634560. Its totient is φ = 1449472032.

The previous prime is 2181958267. The next prime is 2181958301. The reversal of 2181958287 is 7828591812.

It is not a de Polignac number, because 2181958287 - 2¹⁰ = 2181957263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181958267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1460713 + ... + 1462205.

It is an arithmetic number, because the mean of its divisors is an integer number (182477160).

Almost surely, 2^2181958287 is an apocalyptic number.

2181958287 is a deficient number, since it is larger than the sum of its proper divisors (737676273).

2181958287 is a wasteful number, since it uses less digits than its factorization.

2181958287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2902.

The product of its digits is 645120, while the sum is 51.

The square root of 2181958287 is about 46711.4363619874. The cubic root of 2181958287 is about 1297.0263961036.

The spelling of 2181958287 in words is "two billion, one hundred eighty-one million, nine hundred fifty-eight thousand, two hundred eighty-seven".