820499963 has 2 divisors, whose sum is σ = 820499964. Its totient is φ = 820499962.

The previous prime is 820499941. The next prime is 820499983. The reversal of 820499963 is 369994028.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 820499963 - 2²⁴ = 803722747 is a prime.

It is not a weakly prime, because it can be changed into another prime (820499923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410249981 + 410249982.

It is an arithmetic number, because the mean of its divisors is an integer number (410249982).

Almost surely, 2^820499963 is an apocalyptic number.

820499963 is a deficient number, since it is larger than the sum of its proper divisors (1).

820499963 is an equidigital number, since it uses as much as digits as its factorization.

820499963 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 50.

The square root of 820499963 is about 28644.3705289539. The cubic root of 820499963 is about 936.1803514909.

The spelling of 820499963 in words is "eight hundred twenty million, four hundred ninety-nine thousand, nine hundred sixty-three".