215136091 has 2 divisors, whose sum is σ = 215136092. Its totient is φ = 215136090.

The previous prime is 215136041. The next prime is 215136101. The reversal of 215136091 is 190631512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215136091 - 2¹⁵ = 215103323 is a prime.

It is not a weakly prime, because it can be changed into another prime (215136011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107568045 + 107568046.

It is an arithmetic number, because the mean of its divisors is an integer number (107568046).

Almost surely, 2^215136091 is an apocalyptic number.

215136091 is a deficient number, since it is larger than the sum of its proper divisors (1).

215136091 is an equidigital number, since it uses as much as digits as its factorization.

215136091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 215136091 is about 14667.5182290666. The cubic root of 215136091 is about 599.1990154413.

The spelling of 215136091 in words is "two hundred fifteen million, one hundred thirty-six thousand, ninety-one".