215449489 has 2 divisors, whose sum is σ = 215449490. Its totient is φ = 215449488.

The previous prime is 215449477. The next prime is 215449501. The reversal of 215449489 is 984944512.

It is a balanced prime because it is at equal distance from previous prime (215449477) and next prime (215449501).

It can be written as a sum of positive squares in only one way, i.e., 200703889 + 14745600 = 14167^2 + 3840^2 .

It is a cyclic number.

It is not a de Polignac number, because 215449489 - 2⁷ = 215449361 is a prime.

It is a super-2 number, since 2×215449489² = 92836964620722242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (215449459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107724744 + 107724745.

It is an arithmetic number, because the mean of its divisors is an integer number (107724745).

Almost surely, 2^215449489 is an apocalyptic number.

It is an amenable number.

215449489 is a deficient number, since it is larger than the sum of its proper divisors (1).

215449489 is an equidigital number, since it uses as much as digits as its factorization.

215449489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 46.

The square root of 215449489 is about 14678.1977435924. The cubic root of 215449489 is about 599.4898339332.

The spelling of 215449489 in words is "two hundred fifteen million, four hundred forty-nine thousand, four hundred eighty-nine".