215314409 has 2 divisors, whose sum is σ = 215314410. Its totient is φ = 215314408.

The previous prime is 215314399. The next prime is 215314417. The reversal of 215314409 is 904413512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 213744400 + 1570009 = 14620^2 + 1253^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215314409 is a prime.

It is not a weakly prime, because it can be changed into another prime (215314439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107657204 + 107657205.

It is an arithmetic number, because the mean of its divisors is an integer number (107657205).

Almost surely, 2^215314409 is an apocalyptic number.

It is an amenable number.

215314409 is a deficient number, since it is larger than the sum of its proper divisors (1).

215314409 is an equidigital number, since it uses as much as digits as its factorization.

215314409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 215314409 is about 14673.5956397878. The cubic root of 215314409 is about 599.3645206996.

The spelling of 215314409 in words is "two hundred fifteen million, three hundred fourteen thousand, four hundred nine".