215045771 has 2 divisors, whose sum is σ = 215045772. Its totient is φ = 215045770.

The previous prime is 215045731. The next prime is 215045777. The reversal of 215045771 is 177540512.

215045771 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 not a de Polignac number, because 215045771 - 2¹⁴ = 215029387 is a prime.

It is not a weakly prime, because it can be changed into another prime (215045777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107522885 + 107522886.

It is an arithmetic number, because the mean of its divisors is an integer number (107522886).

Almost surely, 2^215045771 is an apocalyptic number.

215045771 is a deficient number, since it is larger than the sum of its proper divisors (1).

215045771 is an equidigital number, since it uses as much as digits as its factorization.

215045771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9800, while the sum is 32.

The square root of 215045771 is about 14664.4389937017. The cubic root of 215045771 is about 599.1151503396.

The spelling of 215045771 in words is "two hundred fifteen million, forty-five thousand, seven hundred seventy-one".