149123521 has 4 divisors (see below), whose sum is σ = 150124500. Its totient is φ = 148122544.

The previous prime is 149123483. The next prime is 149123531. The reversal of 149123521 is 125321941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125321941 = 11117 ⋅11273.

It can be written as a sum of positive squares in 2 ways, for example, as 55711296 + 93412225 = 7464^2 + 9665^2 .

It is a cyclic number.

It is not a de Polignac number, because 149123521 - 2⁷ = 149123393 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 149123521.

It is not an unprimeable number, because it can be changed into a prime (149123531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500266 + ... + 500563.

It is an arithmetic number, because the mean of its divisors is an integer number (37531125).

Almost surely, 2^149123521 is an apocalyptic number.

It is an amenable number.

149123521 is a deficient number, since it is larger than the sum of its proper divisors (1000979).

149123521 is a wasteful number, since it uses less digits than its factorization.

149123521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000978.

The product of its digits is 2160, while the sum is 28.

The square root of 149123521 is about 12211.6141848652. The cubic root of 149123521 is about 530.2923757637.

The spelling of 149123521 in words is "one hundred forty-nine million, one hundred twenty-three thousand, five hundred twenty-one".