148235221 has 2 divisors, whose sum is σ = 148235222. Its totient is φ = 148235220.

The previous prime is 148235203. The next prime is 148235237. The reversal of 148235221 is 122532841.

It is the 4971-st star number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117831025 + 30404196 = 10855^2 + 5514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-148235221 is a prime.

It is equal to p_8350714 and since 148235221 and 8350714 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 148235221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (148235201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74117610 + 74117611.

It is an arithmetic number, because the mean of its divisors is an integer number (74117611).

Almost surely, 2^148235221 is an apocalyptic number.

It is an amenable number.

148235221 is a deficient number, since it is larger than the sum of its proper divisors (1).

148235221 is an equidigital number, since it uses as much as digits as its factorization.

148235221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 28.

The square root of 148235221 is about 12175.1887459702. The cubic root of 148235221 is about 529.2373283392.

The spelling of 148235221 in words is "one hundred forty-eight million, two hundred thirty-five thousand, two hundred twenty-one".