149023921 has 4 divisors (see below), whose sum is σ = 157790052. Its totient is φ = 140257792.

The previous prime is 149023907. The next prime is 149023933. The reversal of 149023921 is 129320941.

149023921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129320941 = 727 ⋅177883.

It can be written as a sum of positive squares in 2 ways, for example, as 68293696 + 80730225 = 8264^2 + 8985^2 .

It is a cyclic number.

It is not a de Polignac number, because 149023921 - 2⁹ = 149023409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149023951) 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, 4383040 + ... + 4383073.

It is an arithmetic number, because the mean of its divisors is an integer number (39447513).

Almost surely, 2^149023921 is an apocalyptic number.

It is an amenable number.

149023921 is a deficient number, since it is larger than the sum of its proper divisors (8766131).

149023921 is an equidigital number, since it uses as much as digits as its factorization.

149023921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8766130.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 149023921 is about 12207.5354187485. The cubic root of 149023921 is about 530.1742882357.

The spelling of 149023921 in words is "one hundred forty-nine million, twenty-three thousand, nine hundred twenty-one".