869720031 has 8 divisors (see below), whose sum is σ = 1288474160. Its totient is φ = 579813336.

The previous prime is 869720011. The next prime is 869720057. The reversal of 869720031 is 130027968.

It is not a de Polignac number, because 869720031 - 2⁹ = 869719519 is a prime.

It is a super-2 number, since 2×869720031² = 1512825864645281922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (869720011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16105900 + ... + 16105953.

It is an arithmetic number, because the mean of its divisors is an integer number (161059270).

Almost surely, 2^869720031 is an apocalyptic number.

869720031 is a deficient number, since it is larger than the sum of its proper divisors (418754129).

869720031 is a wasteful number, since it uses less digits than its factorization.

869720031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32211862 (or 32211856 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 869720031 is about 29491.0161066044. The cubic root of 869720031 is about 954.5378577726.

Adding to 869720031 its reverse (130027968), we get a palindrome (999747999).

The spelling of 869720031 in words is "eight hundred sixty-nine million, seven hundred twenty thousand, thirty-one".