149205689 has 4 divisors (see below), whose sum is σ = 157058640. Its totient is φ = 141352740.

The previous prime is 149205677. The next prime is 149205713. The reversal of 149205689 is 986502941.

149205689 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 149205689 - 2⁴ = 149205673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149205389) 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, 3926447 + ... + 3926484.

It is an arithmetic number, because the mean of its divisors is an integer number (39264660).

Almost surely, 2^149205689 is an apocalyptic number.

149205689 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

149205689 is a deficient number, since it is larger than the sum of its proper divisors (7852951).

149205689 is an equidigital number, since it uses as much as digits as its factorization.

149205689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7852950.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 149205689 is about 12214.9780597429. The cubic root of 149205689 is about 530.3897560274.

The spelling of 149205689 in words is "one hundred forty-nine million, two hundred five thousand, six hundred eighty-nine".