2155019791 has 2 divisors, whose sum is σ = 2155019792. Its totient is φ = 2155019790.

The previous prime is 2155019771. The next prime is 2155019821. The reversal of 2155019791 is 1979105512.

2155019791 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 2155019791 - 2⁵ = 2155019759 is a prime.

It is a super-2 number, since 2×2155019791² = 9288220599203367362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2155019771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077509895 + 1077509896.

It is an arithmetic number, because the mean of its divisors is an integer number (1077509896).

Almost surely, 2^2155019791 is an apocalyptic number.

2155019791 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155019791 is an equidigital number, since it uses as much as digits as its factorization.

2155019791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28350, while the sum is 40.

The square root of 2155019791 is about 46422.1907173714. The cubic root of 2155019791 is about 1291.6665740372. Note that the first 3 decimals are identical.

The spelling of 2155019791 in words is "two billion, one hundred fifty-five million, nineteen thousand, seven hundred ninety-one".