149407921 has 4 divisors (see below), whose sum is σ = 160900852. Its totient is φ = 137914992.

The previous prime is 149407897. The next prime is 149407957. The reversal of 149407921 is 129704941.

149407921 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: 129704941 = 3259 ⋅39799.

It can be written as a sum of positive squares in 2 ways, for example, as 61779600 + 87628321 = 7860^2 + 9361^2 .

It is a cyclic number.

It is not a de Polignac number, because 149407921 - 2⁵ = 149407889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149407021) 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, 5746446 + ... + 5746471.

It is an arithmetic number, because the mean of its divisors is an integer number (40225213).

Almost surely, 2^149407921 is an apocalyptic number.

It is an amenable number.

149407921 is a deficient number, since it is larger than the sum of its proper divisors (11492931).

149407921 is a wasteful number, since it uses less digits than its factorization.

149407921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11492930.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 149407921 is about 12223.2532903479. The cubic root of 149407921 is about 530.6292762891.

The spelling of 149407921 in words is "one hundred forty-nine million, four hundred seven thousand, nine hundred twenty-one".