158042381 has 4 divisors (see below), whose sum is σ = 180619872. Its totient is φ = 135464892.

The previous prime is 158042369. The next prime is 158042383. The reversal of 158042381 is 183240851.

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.

It is a cyclic number.

It is not a de Polignac number, because 158042381 - 2²² = 153848077 is a prime.

It is a super-2 number, since 2×158042381² = 49954788384298322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158042383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11288735 + ... + 11288748.

It is an arithmetic number, because the mean of its divisors is an integer number (45154968).

Almost surely, 2^158042381 is an apocalyptic number.

It is an amenable number.

158042381 is a deficient number, since it is larger than the sum of its proper divisors (22577491).

158042381 is an equidigital number, since it uses as much as digits as its factorization.

158042381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22577490.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 158042381 is about 12571.4908026057. The cubic root of 158042381 is about 540.6603501270.

The spelling of 158042381 in words is "one hundred fifty-eight million, forty-two thousand, three hundred eighty-one".