158203181 has 2 divisors, whose sum is σ = 158203182. Its totient is φ = 158203180.

The previous prime is 158203163. The next prime is 158203183. The reversal of 158203181 is 181302851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119028100 + 39175081 = 10910^2 + 6259^2 .

It is an emirp because it is prime and its reverse (181302851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 158203181 - 2¹⁴ = 158186797 is a prime.

It is a super-2 number, since 2×158203181² = 50056492957037522, which contains 22 as substring.

Together with 158203183, 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 (158203183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79101590 + 79101591.

It is an arithmetic number, because the mean of its divisors is an integer number (79101591).

Almost surely, 2^158203181 is an apocalyptic number.

It is an amenable number.

158203181 is a deficient number, since it is larger than the sum of its proper divisors (1).

158203181 is an equidigital number, since it uses as much as digits as its factorization.

158203181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 158203181 is about 12577.8845995660. The cubic root of 158203181 is about 540.8436526804.

The spelling of 158203181 in words is "one hundred fifty-eight million, two hundred three thousand, one hundred eighty-one".