148988221 has 4 divisors (see below), whose sum is σ = 157752252. Its totient is φ = 140224192.

The previous prime is 148988209. The next prime is 148988251. The reversal of 148988221 is 122889841.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122889841 = 5279 ⋅23279.

It can be written as a sum of positive squares in 2 ways, for example, as 136562596 + 12425625 = 11686^2 + 3525^2 .

It is a cyclic number.

It is not a de Polignac number, because 148988221 - 2⁷ = 148988093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (148988251) 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, 4381990 + ... + 4382023.

It is an arithmetic number, because the mean of its divisors is an integer number (39438063).

Almost surely, 2^148988221 is an apocalyptic number.

It is an amenable number.

148988221 is a deficient number, since it is larger than the sum of its proper divisors (8764031).

148988221 is an equidigital number, since it uses as much as digits as its factorization.

148988221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8764030.

The product of its digits is 73728, while the sum is 43.

The square root of 148988221 is about 12206.0731195581. The cubic root of 148988221 is about 530.1319488727.

The spelling of 148988221 in words is "one hundred forty-eight million, nine hundred eighty-eight thousand, two hundred twenty-one".