215470091 has 2 divisors, whose sum is σ = 215470092. Its totient is φ = 215470090.

The previous prime is 215470061. The next prime is 215470093. The reversal of 215470091 is 190074512.

215470091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215470091 is a prime.

Together with 215470093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (215470093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107735045 + 107735046.

It is an arithmetic number, because the mean of its divisors is an integer number (107735046).

Almost surely, 2^215470091 is an apocalyptic number.

215470091 is a deficient number, since it is larger than the sum of its proper divisors (1).

215470091 is an equidigital number, since it uses as much as digits as its factorization.

215470091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 215470091 is about 14678.8995159719. The cubic root of 215470091 is about 599.5089417311.

The spelling of 215470091 in words is "two hundred fifteen million, four hundred seventy thousand, ninety-one".