154639189 has 4 divisors (see below), whose sum is σ = 161362656. Its totient is φ = 147915724.

The previous prime is 154639183. The next prime is 154639237. The reversal of 154639189 is 981936451.

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 154639189 - 2⁷ = 154639061 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 (154639183) 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, 3361699 + ... + 3361744.

It is an arithmetic number, because the mean of its divisors is an integer number (40340664).

Almost surely, 2^154639189 is an apocalyptic number.

It is an amenable number.

154639189 is a deficient number, since it is larger than the sum of its proper divisors (6723467).

154639189 is an equidigital number, since it uses as much as digits as its factorization.

154639189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6723466.

The product of its digits is 233280, while the sum is 46.

The square root of 154639189 is about 12435.4006368914. The cubic root of 154639189 is about 536.7514023749.

The spelling of 154639189 in words is "one hundred fifty-four million, six hundred thirty-nine thousand, one hundred eighty-nine".