158251381 has 2 divisors, whose sum is σ = 158251382. Its totient is φ = 158251380.

The previous prime is 158251343. The next prime is 158251391. The reversal of 158251381 is 183152851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101324356 + 56927025 = 10066^2 + 7545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158251381 is a prime.

It is a super-2 number, since 2×158251381² = 50086999176814322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158251391) 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, 79125690 + 79125691.

It is an arithmetic number, because the mean of its divisors is an integer number (79125691).

Almost surely, 2^158251381 is an apocalyptic number.

It is an amenable number.

158251381 is a deficient number, since it is larger than the sum of its proper divisors (1).

158251381 is an equidigital number, since it uses as much as digits as its factorization.

158251381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9600, while the sum is 34.

The square root of 158251381 is about 12579.8005151115. The cubic root of 158251381 is about 540.8985736516.

The spelling of 158251381 in words is "one hundred fifty-eight million, two hundred fifty-one thousand, three hundred eighty-one".