215455243 has 2 divisors, whose sum is σ = 215455244. Its totient is φ = 215455242.

The previous prime is 215455211. The next prime is 215455249. The reversal of 215455243 is 342554512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215455243 - 2⁵ = 215455211 is a prime.

It is not a weakly prime, because it can be changed into another prime (215455249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107727621 + 107727622.

It is an arithmetic number, because the mean of its divisors is an integer number (107727622).

Almost surely, 2^215455243 is an apocalyptic number.

215455243 is a deficient number, since it is larger than the sum of its proper divisors (1).

215455243 is an equidigital number, since it uses as much as digits as its factorization.

215455243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24000, while the sum is 31.

The square root of 215455243 is about 14678.3937472736. The cubic root of 215455243 is about 599.4951707352.

The spelling of 215455243 in words is "two hundred fifteen million, four hundred fifty-five thousand, two hundred forty-three".