215545133 has 2 divisors, whose sum is σ = 215545134. Its totient is φ = 215545132.

The previous prime is 215545103. The next prime is 215545153. The reversal of 215545133 is 331545512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136726249 + 78818884 = 11693^2 + 8878^2 .

It is a cyclic number.

It is not a de Polignac number, because 215545133 - 2¹⁶ = 215479597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215545096 and 215545105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215545103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107772566 + 107772567.

It is an arithmetic number, because the mean of its divisors is an integer number (107772567).

Almost surely, 2^215545133 is an apocalyptic number.

It is an amenable number.

215545133 is a deficient number, since it is larger than the sum of its proper divisors (1).

215545133 is an equidigital number, since it uses as much as digits as its factorization.

215545133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9000, while the sum is 29.

The square root of 215545133 is about 14681.4554115047. The cubic root of 215545133 is about 599.5785308608.

The spelling of 215545133 in words is "two hundred fifteen million, five hundred forty-five thousand, one hundred thirty-three".