2161977287 has 2 divisors, whose sum is σ = 2161977288. Its totient is φ = 2161977286.

The previous prime is 2161977281. The next prime is 2161977341. The reversal of 2161977287 is 7827791612.

It is a happy number.

2161977287 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2161977287 - 2²⁰ = 2160928711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161977281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080988643 + 1080988644.

It is an arithmetic number, because the mean of its divisors is an integer number (1080988644).

Almost surely, 2^2161977287 is an apocalyptic number.

2161977287 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161977287 is an equidigital number, since it uses as much as digits as its factorization.

2161977287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 592704, while the sum is 50.

The square root of 2161977287 is about 46497.0675096828. The cubic root of 2161977287 is about 1293.0551322138.

The spelling of 2161977287 in words is "two billion, one hundred sixty-one million, nine hundred seventy-seven thousand, two hundred eighty-seven".