158349821 has 12 divisors (see below), whose sum is σ = 184519260. Its totient is φ = 135495360.

The previous prime is 158349817. The next prime is 158349833. The reversal of 158349821 is 128943851.

It can be written as a sum of positive squares in 2 ways, for example, as 118483225 + 39866596 = 10885^2 + 6314^2 .

It is not a de Polignac number, because 158349821 - 2² = 158349817 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 (158349811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29945 + ... + 34833.

It is an arithmetic number, because the mean of its divisors is an integer number (15376605).

Almost surely, 2^158349821 is an apocalyptic number.

It is an amenable number.

158349821 is a deficient number, since it is larger than the sum of its proper divisors (26169439).

158349821 is an equidigital number, since it uses as much as digits as its factorization.

158349821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5564 (or 5557 counting only the distinct ones).

The product of its digits is 69120, while the sum is 41.

The square root of 158349821 is about 12583.7125285029. The cubic root of 158349821 is about 541.0107054142.

The spelling of 158349821 in words is "one hundred fifty-eight million, three hundred forty-nine thousand, eight hundred twenty-one".