149123999 has 4 divisors (see below), whose sum is σ = 149298864. Its totient is φ = 148949136.

The previous prime is 149123941. The next prime is 149124007. The reversal of 149123999 is 999321941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999321941 = 113 ⋅8843557.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149123999 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 (149123899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86147 + ... + 87860.

It is an arithmetic number, because the mean of its divisors is an integer number (37324716).

Almost surely, 2^149123999 is an apocalyptic number.

149123999 is a deficient number, since it is larger than the sum of its proper divisors (174865).

149123999 is an equidigital number, since it uses as much as digits as its factorization.

149123999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174864.

The product of its digits is 157464, while the sum is 47.

The square root of 149123999 is about 12211.6337563817. The cubic root of 149123999 is about 530.2929423622.

The spelling of 149123999 in words is "one hundred forty-nine million, one hundred twenty-three thousand, nine hundred ninety-nine".