158857381 has 2 divisors, whose sum is σ = 158857382. Its totient is φ = 158857380.

The previous prime is 158857357. The next prime is 158857409. The reversal of 158857381 is 183758851.

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., 158508100 + 349281 = 12590^2 + 591^2 .

It is a cyclic number.

It is not a de Polignac number, because 158857381 - 2⁷ = 158857253 is a prime.

It is a super-2 number, since 2×158857381² = 50471334996358322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158857301) 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, 79428690 + 79428691.

It is an arithmetic number, because the mean of its divisors is an integer number (79428691).

Almost surely, 2^158857381 is an apocalyptic number.

It is an amenable number.

158857381 is a deficient number, since it is larger than the sum of its proper divisors (1).

158857381 is an equidigital number, since it uses as much as digits as its factorization.

158857381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 268800, while the sum is 46.

The square root of 158857381 is about 12603.8637329987. The cubic root of 158857381 is about 541.5881242910.

The spelling of 158857381 in words is "one hundred fifty-eight million, eight hundred fifty-seven thousand, three hundred eighty-one".