215315449 has 2 divisors, whose sum is σ = 215315450. Its totient is φ = 215315448.

The previous prime is 215315437. The next prime is 215315479. The reversal of 215315449 is 944513512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138227049 + 77088400 = 11757^2 + 8780^2 .

It is a cyclic number.

It is not a de Polignac number, because 215315449 - 2⁵ = 215315417 is a prime.

It is not a weakly prime, because it can be changed into another prime (215315479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107657724 + 107657725.

It is an arithmetic number, because the mean of its divisors is an integer number (107657725).

Almost surely, 2^215315449 is an apocalyptic number.

It is an amenable number.

215315449 is a deficient number, since it is larger than the sum of its proper divisors (1).

215315449 is an equidigital number, since it uses as much as digits as its factorization.

215315449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 34.

The square root of 215315449 is about 14673.6310775486. The cubic root of 215315449 is about 599.3654857040.

The spelling of 215315449 in words is "two hundred fifteen million, three hundred fifteen thousand, four hundred forty-nine".