215683924397 has 2 divisors, whose sum is σ = 215683924398. Its totient is φ = 215683924396.

The previous prime is 215683924327. The next prime is 215683924399. The reversal of 215683924397 is 793429386512.

It is a happy number.

215683924397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142076978761 + 73606945636 = 376931^2 + 271306^2 .

It is a cyclic number.

It is not a de Polignac number, because 215683924397 - 2³⁴ = 198504055213 is a prime.

Together with 215683924399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215683924399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107841962198 + 107841962199.

It is an arithmetic number, because the mean of its divisors is an integer number (107841962199).

Almost surely, 2^215683924397 is an apocalyptic number.

It is an amenable number.

215683924397 is a deficient number, since it is larger than the sum of its proper divisors (1).

215683924397 is an equidigital number, since it uses as much as digits as its factorization.

215683924397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19595520, while the sum is 59.

The spelling of 215683924397 in words is "two hundred fifteen billion, six hundred eighty-three million, nine hundred twenty-four thousand, three hundred ninety-seven".