215541449 has 2 divisors, whose sum is σ = 215541450. Its totient is φ = 215541448.

The previous prime is 215541437. The next prime is 215541457. The reversal of 215541449 is 944145512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153636025 + 61905424 = 12395^2 + 7868^2 .

It is a cyclic number.

It is not a de Polignac number, because 215541449 - 2¹² = 215537353 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (215541409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107770724 + 107770725.

It is an arithmetic number, because the mean of its divisors is an integer number (107770725).

Almost surely, 2^215541449 is an apocalyptic number.

It is an amenable number.

215541449 is a deficient number, since it is larger than the sum of its proper divisors (1).

215541449 is an equidigital number, since it uses as much as digits as its factorization.

215541449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 35.

The square root of 215541449 is about 14681.3299465682. The cubic root of 215541449 is about 599.5751149329.

The spelling of 215541449 in words is "two hundred fifteen million, five hundred forty-one thousand, four hundred forty-nine".