215129393 has 2 divisors, whose sum is σ = 215129394. Its totient is φ = 215129392.

The previous prime is 215129377. The next prime is 215129417. The reversal of 215129393 is 393921512.

215129393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197346304 + 17783089 = 14048^2 + 4217^2 .

It is a cyclic number.

It is not a de Polignac number, because 215129393 - 2⁴ = 215129377 is a prime.

It is not a weakly prime, because it can be changed into another prime (215129323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107564696 + 107564697.

It is an arithmetic number, because the mean of its divisors is an integer number (107564697).

Almost surely, 2^215129393 is an apocalyptic number.

It is an amenable number.

215129393 is a deficient number, since it is larger than the sum of its proper divisors (1).

215129393 is an equidigital number, since it uses as much as digits as its factorization.

215129393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14580, while the sum is 35.

The square root of 215129393 is about 14667.2898996372. The cubic root of 215129393 is about 599.1927969331.

The spelling of 215129393 in words is "two hundred fifteen million, one hundred twenty-nine thousand, three hundred ninety-three".