158381 has 4 divisors (see below), whose sum is σ = 159264. Its totient is φ = 157500.

The previous prime is 158371. The next prime is 158393. The reversal of 158381 is 183851.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 183851 = 113 ⋅1627.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158381 is a prime.

It is a super-2 number, since 2×158381² = 50169082322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 158381.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 158381.

It is not an unprimeable number, because it can be changed into a prime (158341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65 + ... + 566.

It is an arithmetic number, because the mean of its divisors is an integer number (39816).

2¹⁵⁸³⁸¹ is an apocalyptic number.

It is an amenable number.

158381 is a deficient number, since it is larger than the sum of its proper divisors (883).

158381 is an equidigital number, since it uses as much as digits as its factorization.

158381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882.

The product of its digits is 960, while the sum is 26.

The square root of 158381 is about 397.9711044787. The cubic root of 158381 is about 54.1046211329.

The spelling of 158381 in words is "one hundred fifty-eight thousand, three hundred eighty-one".