215730133 has 4 divisors (see below), whose sum is σ = 225109728. Its totient is φ = 206350540.

The previous prime is 215730121. The next prime is 215730139. The reversal of 215730133 is 331037512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 215730133 - 2¹³ = 215721941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215730098 and 215730107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215730139) 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, 4689763 + ... + 4689808.

It is an arithmetic number, because the mean of its divisors is an integer number (56277432).

Almost surely, 2^215730133 is an apocalyptic number.

215730133 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

215730133 is a deficient number, since it is larger than the sum of its proper divisors (9379595).

215730133 is an equidigital number, since it uses as much as digits as its factorization.

215730133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9379594.

The product of its (nonzero) digits is 1890, while the sum is 25.

The square root of 215730133 is about 14687.7545254542. The cubic root of 215730133 is about 599.7500190118.

Adding to 215730133 its reverse (331037512), we get a palindrome (546767645).

The spelling of 215730133 in words is "two hundred fifteen million, seven hundred thirty thousand, one hundred thirty-three".