215959797 has 8 divisors (see below), whose sum is σ = 319940480. Its totient is φ = 143973180.

The previous prime is 215959763. The next prime is 215959801. The reversal of 215959797 is 797959512.

It is not a de Polignac number, because 215959797 - 2¹⁵ = 215927029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215959697) 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 in 7 ways as a sum of consecutive naturals, for example, 3999229 + ... + 3999282.

It is an arithmetic number, because the mean of its divisors is an integer number (39992560).

Almost surely, 2^215959797 is an apocalyptic number.

215959797 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

215959797 is a deficient number, since it is larger than the sum of its proper divisors (103980683).

215959797 is an equidigital number, since it uses as much as digits as its factorization.

215959797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7998520 (or 7998514 counting only the distinct ones).

The product of its digits is 1786050, while the sum is 54.

The square root of 215959797 is about 14695.5706592157. The cubic root of 215959797 is about 599.9627726903.

The spelling of 215959797 in words is "two hundred fifteen million, nine hundred fifty-nine thousand, seven hundred ninety-seven".