829215449 has 2 divisors, whose sum is σ = 829215450. Its totient is φ = 829215448.

The previous prime is 829215421. The next prime is 829215479. The reversal of 829215449 is 944512928.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 505935049 + 323280400 = 22493^2 + 17980^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-829215449 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (829215419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 414607724 + 414607725.

It is an arithmetic number, because the mean of its divisors is an integer number (414607725).

Almost surely, 2^829215449 is an apocalyptic number.

It is an amenable number.

829215449 is a deficient number, since it is larger than the sum of its proper divisors (1).

829215449 is an equidigital number, since it uses as much as digits as its factorization.

829215449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 44.

The square root of 829215449 is about 28796.1012812499. The cubic root of 829215449 is about 939.4834377013.

The spelling of 829215449 in words is "eight hundred twenty-nine million, two hundred fifteen thousand, four hundred forty-nine".