133220385 has 12 divisors (see below), whose sum is σ = 230915412. Its totient is φ = 71050848.

The previous prime is 133220383. The next prime is 133220413. The reversal of 133220385 is 583022331.

It can be written as a sum of positive squares in 2 ways, for example, as 66781584 + 66438801 = 8172^2 + 8151^2 .

It is not a de Polignac number, because 133220385 - 2¹ = 133220383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133220383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1480182 + ... + 1480271.

It is an arithmetic number, because the mean of its divisors is an integer number (19242951).

Almost surely, 2^133220385 is an apocalyptic number.

133220385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

133220385 is a deficient number, since it is larger than the sum of its proper divisors (97695027).

133220385 is a wasteful number, since it uses less digits than its factorization.

133220385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2960464 (or 2960461 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 133220385 is about 11542.1135412887. The cubic root of 133220385 is about 510.7286585543.

The spelling of 133220385 in words is "one hundred thirty-three million, two hundred twenty thousand, three hundred eighty-five".