158221043 has 4 divisors (see below), whose sum is σ = 158918280. Its totient is φ = 157523808.

The previous prime is 158221039. The next prime is 158221051. The reversal of 158221043 is 340122851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 340122851 = 971 ⋅350281.

It is a cyclic number.

It is not a de Polignac number, because 158221043 - 2² = 158221039 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158221543) 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, 348278 + ... + 348731.

It is an arithmetic number, because the mean of its divisors is an integer number (39729570).

Almost surely, 2^158221043 is an apocalyptic number.

158221043 is a deficient number, since it is larger than the sum of its proper divisors (697237).

158221043 is an equidigital number, since it uses as much as digits as its factorization.

158221043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697236.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 158221043 is about 12578.5946353319. The cubic root of 158221043 is about 540.8640066448.

Adding to 158221043 its reverse (340122851), we get a palindrome (498343894).

The spelling of 158221043 in words is "one hundred fifty-eight million, two hundred twenty-one thousand, forty-three".