820514969 has 4 divisors (see below), whose sum is σ = 821760720. Its totient is φ = 819269220.

The previous prime is 820514879. The next prime is 820514983. The reversal of 820514969 is 969415028.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820514969 is a prime.

It is a super-2 number, since 2×820514969² = 1346489628706141922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (820510969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 621887 + ... + 623204.

It is an arithmetic number, because the mean of its divisors is an integer number (205440180).

Almost surely, 2^820514969 is an apocalyptic number.

It is an amenable number.

820514969 is a deficient number, since it is larger than the sum of its proper divisors (1245751).

820514969 is a wasteful number, since it uses less digits than its factorization.

820514969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245750.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 820514969 is about 28644.6324640411. The cubic root of 820514969 is about 936.1860586765.

The spelling of 820514969 in words is "eight hundred twenty million, five hundred fourteen thousand, nine hundred sixty-nine".