2155927771 has 2 divisors, whose sum is σ = 2155927772. Its totient is φ = 2155927770.

The previous prime is 2155927757. The next prime is 2155927783. The reversal of 2155927771 is 1777295512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2155927771 - 2³¹ = 8444123 is a prime.

It is not a weakly prime, because it can be changed into another prime (2155927171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077963885 + 1077963886.

It is an arithmetic number, because the mean of its divisors is an integer number (1077963886).

Almost surely, 2^2155927771 is an apocalyptic number.

2155927771 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155927771 is an equidigital number, since it uses as much as digits as its factorization.

2155927771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 308700, while the sum is 46.

The square root of 2155927771 is about 46431.9692776432. The cubic root of 2155927771 is about 1291.8479556260.

The spelling of 2155927771 in words is "two billion, one hundred fifty-five million, nine hundred twenty-seven thousand, seven hundred seventy-one".