215355379 has 2 divisors, whose sum is σ = 215355380. Its totient is φ = 215355378.

The previous prime is 215355323. The next prime is 215355389. The reversal of 215355379 is 973553512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215355379 is a prime.

It is not a weakly prime, because it can be changed into another prime (215355389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107677689 + 107677690.

It is an arithmetic number, because the mean of its divisors is an integer number (107677690).

Almost surely, 2^215355379 is an apocalyptic number.

215355379 is a deficient number, since it is larger than the sum of its proper divisors (1).

215355379 is an equidigital number, since it uses as much as digits as its factorization.

215355379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141750, while the sum is 40.

The square root of 215355379 is about 14674.9916183962. The cubic root of 215355379 is about 599.4025339584.

The spelling of 215355379 in words is "two hundred fifteen million, three hundred fifty-five thousand, three hundred seventy-nine".