2155019771 has 2 divisors, whose sum is σ = 2155019772. Its totient is φ = 2155019770.

The previous prime is 2155019759. The next prime is 2155019791. The reversal of 2155019771 is 1779105512.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2155019771 - 2³⁰ = 1081277947 is a prime.

It is a super-2 number, since 2×2155019771² = 9288220426801784882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2155019791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077509885 + 1077509886.

It is an arithmetic number, because the mean of its divisors is an integer number (1077509886).

Almost surely, 2^2155019771 is an apocalyptic number.

2155019771 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155019771 is an equidigital number, since it uses as much as digits as its factorization.

2155019771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22050, while the sum is 38.

The square root of 2155019771 is about 46422.1905019571. The cubic root of 2155019771 is about 1291.6665700414. Note that the first 3 decimals are identical.

The spelling of 2155019771 in words is "two billion, one hundred fifty-five million, nineteen thousand, seven hundred seventy-one".