2158152181 has 2 divisors, whose sum is σ = 2158152182. Its totient is φ = 2158152180.

The previous prime is 2158152179. The next prime is 2158152187. The reversal of 2158152181 is 1812518512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1600720081 + 557432100 = 40009^2 + 23610^2 .

It is a cyclic number.

It is not a de Polignac number, because 2158152181 - 2¹ = 2158152179 is a prime.

It is a super-2 number, since 2×2158152181² = 9315241672710113522, which contains 22 as substring.

Together with 2158152179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2158152187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079076090 + 1079076091.

It is an arithmetic number, because the mean of its divisors is an integer number (1079076091).

Almost surely, 2^2158152181 is an apocalyptic number.

It is an amenable number.

2158152181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158152181 is an equidigital number, since it uses as much as digits as its factorization.

2158152181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6400, while the sum is 34.

The square root of 2158152181 is about 46455.9165338496. The cubic root of 2158152181 is about 1292.2920972500.

The spelling of 2158152181 in words is "two billion, one hundred fifty-eight million, one hundred fifty-two thousand, one hundred eighty-one".