149688449 has 4 divisors (see below), whose sum is σ = 152142420. Its totient is φ = 147234480.

The previous prime is 149688443. The next prime is 149688493. The reversal of 149688449 is 944886941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 944886941 = 661 ⋅1429481.

It can be written as a sum of positive squares in 2 ways, for example, as 20638849 + 129049600 = 4543^2 + 11360^2 .

It is not a de Polignac number, because 149688449 - 2⁸ = 149688193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 149688449.

It is not an unprimeable number, because it can be changed into a prime (149688443) 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, 1226894 + ... + 1227015.

It is an arithmetic number, because the mean of its divisors is an integer number (38035605).

Almost surely, 2^149688449 is an apocalyptic number.

It is an amenable number.

149688449 is a deficient number, since it is larger than the sum of its proper divisors (2453971).

149688449 is an equidigital number, since it uses as much as digits as its factorization.

149688449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2453970.

The product of its digits is 1990656, while the sum is 53.

The square root of 149688449 is about 12234.7230863637. The cubic root of 149688449 is about 530.9611714603.

The spelling of 149688449 in words is "one hundred forty-nine million, six hundred eighty-eight thousand, four hundred forty-nine".