215255857 has 2 divisors, whose sum is σ = 215255858. Its totient is φ = 215255856.

The previous prime is 215255837. The next prime is 215255861. The reversal of 215255857 is 758552512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201185856 + 14070001 = 14184^2 + 3751^2 .

It is a cyclic number.

It is not a de Polignac number, because 215255857 - 2¹¹ = 215253809 is a prime.

It is not a weakly prime, because it can be changed into another prime (215255837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107627928 + 107627929.

It is an arithmetic number, because the mean of its divisors is an integer number (107627929).

Almost surely, 2^215255857 is an apocalyptic number.

It is an amenable number.

215255857 is a deficient number, since it is larger than the sum of its proper divisors (1).

215255857 is an equidigital number, since it uses as much as digits as its factorization.

215255857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 140000, while the sum is 40.

The square root of 215255857 is about 14671.6003557894. The cubic root of 215255857 is about 599.3101859352.

The spelling of 215255857 in words is "two hundred fifteen million, two hundred fifty-five thousand, eight hundred fifty-seven".