158989421 has 4 divisors (see below), whose sum is σ = 164118144. Its totient is φ = 153860700.

The previous prime is 158989417. The next prime is 158989427. The reversal of 158989421 is 124989851.

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 158989421 - 2² = 158989417 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 (158989427) 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, 2564315 + ... + 2564376.

It is an arithmetic number, because the mean of its divisors is an integer number (41029536).

Almost surely, 2^158989421 is an apocalyptic number.

It is an amenable number.

158989421 is a deficient number, since it is larger than the sum of its proper divisors (5128723).

158989421 is an equidigital number, since it uses as much as digits as its factorization.

158989421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5128722.

The product of its digits is 207360, while the sum is 47.

The square root of 158989421 is about 12609.1007213044. The cubic root of 158989421 is about 541.7381361896.

The spelling of 158989421 in words is "one hundred fifty-eight million, nine hundred eighty-nine thousand, four hundred twenty-one".