149989009 has 9 divisors (see below), whose sum is σ = 154619451. Its totient is φ = 145494360.

The previous prime is 149988997. The next prime is 149989013. The reversal of 149989009 is 900989941.

The square root of 149989009 is 12247.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 134212225 + 15776784 = 11585^2 + 3972^2 .

It is a de Polignac number, because none of the positive numbers 2^k-149989009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149989109) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 452974 + ... + 453304.

It is an arithmetic number, because the mean of its divisors is an integer number (17179939).

Almost surely, 2^149989009 is an apocalyptic number.

149989009 is the 12247-th square number.

149989009 is the 6124-th centered octagonal number.

It is an amenable number.

149989009 is a deficient number, since it is larger than the sum of its proper divisors (4630442).

149989009 is an frugal number, since it uses more digits than its factorization.

149989009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 49.

The cubic root of 149989009 is about 531.3163068517.

Multiplying 149989009 by its sum of digits (49), we get a square (7349461441 = 85729²).

The spelling of 149989009 in words is "one hundred forty-nine million, nine hundred eighty-nine thousand, nine".