215433091 has 2 divisors, whose sum is σ = 215433092. Its totient is φ = 215433090.

The previous prime is 215433089. The next prime is 215433143. The reversal of 215433091 is 190334512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215433091 - 2¹ = 215433089 is a prime.

It is a super-2 number, since 2×215433091² = 92822833395628562, which contains 22 as substring.

Together with 215433089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (215433011) 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, 107716545 + 107716546.

It is an arithmetic number, because the mean of its divisors is an integer number (107716546).

Almost surely, 2^215433091 is an apocalyptic number.

215433091 is a deficient number, since it is larger than the sum of its proper divisors (1).

215433091 is an equidigital number, since it uses as much as digits as its factorization.

215433091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 215433091 is about 14677.6391494000. The cubic root of 215433091 is about 599.4746243609.

It can be divided in two parts, 2154 and 33091, that added together give a triangular number (35245 = T₂₆₅).

The spelling of 215433091 in words is "two hundred fifteen million, four hundred thirty-three thousand, ninety-one".