158549221 has 4 divisors (see below), whose sum is σ = 163663744. Its totient is φ = 153434700.

The previous prime is 158549219. The next prime is 158549233. The reversal of 158549221 is 122945851.

158549221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 158549221 - 2¹ = 158549219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158549621) 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, 2557215 + ... + 2557276.

It is an arithmetic number, because the mean of its divisors is an integer number (40915936).

Almost surely, 2^158549221 is an apocalyptic number.

It is an amenable number.

158549221 is a deficient number, since it is larger than the sum of its proper divisors (5114523).

158549221 is an equidigital number, since it uses as much as digits as its factorization.

158549221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5114522.

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

The square root of 158549221 is about 12591.6329759090. The cubic root of 158549221 is about 541.2376971142.

The spelling of 158549221 in words is "one hundred fifty-eight million, five hundred forty-nine thousand, two hundred twenty-one".