158438131 has 4 divisors (see below), whose sum is σ = 166777000. Its totient is φ = 150099264.

The previous prime is 158438123. The next prime is 158438209. The reversal of 158438131 is 131834851.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 158438131 - 2³ = 158438123 is a prime.

It is a super-2 number, since 2×158438131² = 50205282709546322, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (158438831) 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, 4169406 + ... + 4169443.

It is an arithmetic number, because the mean of its divisors is an integer number (41694250).

Almost surely, 2^158438131 is an apocalyptic number.

158438131 is a deficient number, since it is larger than the sum of its proper divisors (8338869).

158438131 is an equidigital number, since it uses as much as digits as its factorization.

158438131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8338868.

The product of its digits is 11520, while the sum is 34.

The square root of 158438131 is about 12587.2209403029. The cubic root of 158438131 is about 541.1112586836. Note that the first 3 decimals are identical.

The spelling of 158438131 in words is "one hundred fifty-eight million, four hundred thirty-eight thousand, one hundred thirty-one".