158781538 has 4 divisors (see below), whose sum is σ = 238172310. Its totient is φ = 79390768.

The previous prime is 158781529. The next prime is 158781559. The reversal of 158781538 is 835187851.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 152695449 + 6086089 = 12357^2 + 2467^2 .

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, 39695383 + ... + 39695386.

Almost surely, 2^158781538 is an apocalyptic number.

158781538 is a deficient number, since it is larger than the sum of its proper divisors (79390772).

158781538 is an equidigital number, since it uses as much as digits as its factorization.

158781538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79390771.

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

The square root of 158781538 is about 12600.8546535543. The cubic root of 158781538 is about 541.5019207490.

The spelling of 158781538 in words is "one hundred fifty-eight million, seven hundred eighty-one thousand, five hundred thirty-eight".