158838181 has 2 divisors, whose sum is σ = 158838182. Its totient is φ = 158838180.

The previous prime is 158838139. The next prime is 158838241. The reversal of 158838181 is 181838851.

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., 118069956 + 40768225 = 10866^2 + 6385^2 .

It is a cyclic number.

It is not a de Polignac number, because 158838181 - 2¹¹ = 158836133 is a prime.

It is a super-2 number, since 2×158838181² = 50459135486777522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158838131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79419090 + 79419091.

It is an arithmetic number, because the mean of its divisors is an integer number (79419091).

Almost surely, 2^158838181 is an apocalyptic number.

It is an amenable number.

158838181 is a deficient number, since it is larger than the sum of its proper divisors (1).

158838181 is an equidigital number, since it uses as much as digits as its factorization.

158838181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61440, while the sum is 43.

The square root of 158838181 is about 12603.1020387839. The cubic root of 158838181 is about 541.5663040669.

The spelling of 158838181 in words is "one hundred fifty-eight million, eight hundred thirty-eight thousand, one hundred eighty-one".