148209191 has 4 divisors (see below), whose sum is σ = 159609912. Its totient is φ = 136808472.

The previous prime is 148209181. The next prime is 148209209. The reversal of 148209191 is 191902841.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191902841 = 13 ⋅14761757.

It is a cyclic number.

It is not a de Polignac number, because 148209191 - 2¹⁰ = 148208167 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 (148209181) 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, 5700341 + ... + 5700366.

It is an arithmetic number, because the mean of its divisors is an integer number (39902478).

Almost surely, 2^148209191 is an apocalyptic number.

148209191 is a deficient number, since it is larger than the sum of its proper divisors (11400721).

148209191 is a wasteful number, since it uses less digits than its factorization.

148209191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11400720.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 148209191 is about 12174.1197217704. The cubic root of 148209191 is about 529.2063486255.

The spelling of 148209191 in words is "one hundred forty-eight million, two hundred nine thousand, one hundred ninety-one".