149981389 has 4 divisors (see below), whose sum is σ = 150018300. Its totient is φ = 149944480.

The previous prime is 149981369. The next prime is 149981393. The reversal of 149981389 is 983189941.

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

It can be written as a sum of positive squares in 2 ways, for example, as 87048900 + 62932489 = 9330^2 + 7933^2 .

It is a cyclic number.

It is not a de Polignac number, because 149981389 - 2⁷ = 149981261 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 (149981339) 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, 11482 + ... + 20779.

It is an arithmetic number, because the mean of its divisors is an integer number (37504575).

Almost surely, 2^149981389 is an apocalyptic number.

It is an amenable number.

149981389 is a deficient number, since it is larger than the sum of its proper divisors (36911).

149981389 is an equidigital number, since it uses as much as digits as its factorization.

149981389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36910.

The product of its digits is 559872, while the sum is 52.

The square root of 149981389 is about 12246.6888994536. The cubic root of 149981389 is about 531.3073090839.

The spelling of 149981389 in words is "one hundred forty-nine million, nine hundred eighty-one thousand, three hundred eighty-nine".