815980829 has 2 divisors, whose sum is σ = 815980830. Its totient is φ = 815980828.

The previous prime is 815980819. The next prime is 815980831. The reversal of 815980829 is 928089518.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 802305625 + 13675204 = 28325^2 + 3698^2 .

It is a cyclic number.

It is not a de Polignac number, because 815980829 - 2⁴ = 815980813 is a prime.

Together with 815980831, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (815980819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407990414 + 407990415.

It is an arithmetic number, because the mean of its divisors is an integer number (407990415).

Almost surely, 2^815980829 is an apocalyptic number.

It is an amenable number.

815980829 is a deficient number, since it is larger than the sum of its proper divisors (1).

815980829 is an equidigital number, since it uses as much as digits as its factorization.

815980829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 414720, while the sum is 50.

The square root of 815980829 is about 28565.3781525818. The cubic root of 815980829 is about 934.4584275407.

It can be divided in two parts, 8159 and 80829, that added together give a palindrome (88988).

The spelling of 815980829 in words is "eight hundred fifteen million, nine hundred eighty thousand, eight hundred twenty-nine".