215978383 has 2 divisors, whose sum is σ = 215978384. Its totient is φ = 215978382.

The previous prime is 215978381. The next prime is 215978401. The reversal of 215978383 is 383879512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215978383 - 2¹ = 215978381 is a prime.

Together with 215978381, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215978381) 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, 107989191 + 107989192.

It is an arithmetic number, because the mean of its divisors is an integer number (107989192).

Almost surely, 2^215978383 is an apocalyptic number.

215978383 is a deficient number, since it is larger than the sum of its proper divisors (1).

215978383 is an equidigital number, since it uses as much as digits as its factorization.

215978383 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 46.

The square root of 215978383 is about 14696.2030130235. The cubic root of 215978383 is about 599.9799835915.

The spelling of 215978383 in words is "two hundred fifteen million, nine hundred seventy-eight thousand, three hundred eighty-three".