158381506 has 4 divisors (see below), whose sum is σ = 237572262. Its totient is φ = 79190752.

The previous prime is 158381479. The next prime is 158381521. The reversal of 158381506 is 605183851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 605183851 = 11329 ⋅53419.

It can be written as a sum of positive squares in only one way, i.e., 104960025 + 53421481 = 10245^2 + 7309^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 39595375 + ... + 39595378.

Almost surely, 2^158381506 is an apocalyptic number.

158381506 is a deficient number, since it is larger than the sum of its proper divisors (79190756).

158381506 is an equidigital number, since it uses as much as digits as its factorization.

158381506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79190755.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 158381506 is about 12584.9714342147. The cubic root of 158381506 is about 541.0467875116.

The spelling of 158381506 in words is "one hundred fifty-eight million, three hundred eighty-one thousand, five hundred six".