215244091 has 2 divisors, whose sum is σ = 215244092. Its totient is φ = 215244090.

The previous prime is 215244083. The next prime is 215244101. The reversal of 215244091 is 190442512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215244091 - 2³ = 215244083 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (215244011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107622045 + 107622046.

It is an arithmetic number, because the mean of its divisors is an integer number (107622046).

Almost surely, 2^215244091 is an apocalyptic number.

215244091 is a deficient number, since it is larger than the sum of its proper divisors (1).

215244091 is an equidigital number, since it uses as much as digits as its factorization.

215244091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 215244091 is about 14671.1993715579. The cubic root of 215244091 is about 599.2992661981.

The spelling of 215244091 in words is "two hundred fifteen million, two hundred forty-four thousand, ninety-one".