158662181 has 2 divisors, whose sum is σ = 158662182. Its totient is φ = 158662180.

The previous prime is 158662171. The next prime is 158662183. The reversal of 158662181 is 181266851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102921025 + 55741156 = 10145^2 + 7466^2 .

It is an emirp because it is prime and its reverse (181266851) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158662181 is a prime.

It is a super-2 number, since 2×158662181² = 50347375359353522, which contains 22 as substring.

Together with 158662183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158662183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79331090 + 79331091.

It is an arithmetic number, because the mean of its divisors is an integer number (79331091).

Almost surely, 2^158662181 is an apocalyptic number.

It is an amenable number.

158662181 is a deficient number, since it is larger than the sum of its proper divisors (1).

158662181 is an equidigital number, since it uses as much as digits as its factorization.

158662181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 38.

The square root of 158662181 is about 12596.1176955441. The cubic root of 158662181 is about 541.3662033621.

The spelling of 158662181 in words is "one hundred fifty-eight million, six hundred sixty-two thousand, one hundred eighty-one".