149873521 has 4 divisors (see below), whose sum is σ = 171284032. Its totient is φ = 128463012.

The previous prime is 149873519. The next prime is 149873527. The reversal of 149873521 is 125378941.

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, and also an emirpimes, since its reverse is a distinct semiprime: 125378941 = 1327 ⋅94483.

It is a cyclic number.

It is not a de Polignac number, because 149873521 - 2¹ = 149873519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149873527) 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, 10705245 + ... + 10705258.

It is an arithmetic number, because the mean of its divisors is an integer number (42821008).

Almost surely, 2^149873521 is an apocalyptic number.

It is an amenable number.

149873521 is a deficient number, since it is larger than the sum of its proper divisors (21410511).

149873521 is an equidigital number, since it uses as much as digits as its factorization.

149873521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21410510.

The product of its digits is 60480, while the sum is 40.

The square root of 149873521 is about 12242.2841414501. The cubic root of 149873521 is about 531.1799048279.

The spelling of 149873521 in words is "one hundred forty-nine million, eight hundred seventy-three thousand, five hundred twenty-one".