215074861 has 2 divisors, whose sum is σ = 215074862. Its totient is φ = 215074860.

The previous prime is 215074841. The next prime is 215074877. The reversal of 215074861 is 168470512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125014761 + 90060100 = 11181^2 + 9490^2 .

It is a cyclic number.

It is not a de Polignac number, because 215074861 - 2⁷ = 215074733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215074841) 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, 107537430 + 107537431.

It is an arithmetic number, because the mean of its divisors is an integer number (107537431).

Almost surely, 2^215074861 is an apocalyptic number.

It is an amenable number.

215074861 is a deficient number, since it is larger than the sum of its proper divisors (1).

215074861 is an equidigital number, since it uses as much as digits as its factorization.

215074861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 215074861 is about 14665.4308153562. The cubic root of 215074861 is about 599.1421639281.

The spelling of 215074861 in words is "two hundred fifteen million, seventy-four thousand, eight hundred sixty-one".