2291187087 has 48 divisors (see below), whose sum is σ = 4120971520. Its totient is φ = 1232205696.

The previous prime is 2291187077. The next prime is 2291187089. The reversal of 2291187087 is 7807811922.

It is not a de Polignac number, because 2291187087 - 2⁷ = 2291186959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2291187089) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33648 + ... + 75594.

Almost surely, 2^2291187087 is an apocalyptic number.

2291187087 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

2291187087 is a deficient number, since it is larger than the sum of its proper divisors (1829784433).

2291187087 is a wasteful number, since it uses less digits than its factorization.

2291187087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41997 (or 41974 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 45.

The square root of 2291187087 is about 47866.3460794743. The cubic root of 2291187087 is about 1318.3180074469.

The spelling of 2291187087 in words is "two billion, two hundred ninety-one million, one hundred eighty-seven thousand, eighty-seven".