873131985 has 192 divisors, whose sum is σ = 1897758720. Its totient is φ = 365783040.

The previous prime is 873131969. The next prime is 873131993. The reversal of 873131985 is 589131378.

It is not a de Polignac number, because 873131985 - 2⁴ = 873131969 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 873131985.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 6874992 + ... + 6875118.

It is an arithmetic number, because the mean of its divisors is an integer number (9884160).

Almost surely, 2^873131985 is an apocalyptic number.

873131985 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

873131985 is an abundant number, since it is smaller than the sum of its proper divisors (1024626735).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

873131985 is a wasteful number, since it uses less digits than its factorization.

873131985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228 (or 225 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 873131985 is about 29548.8068287029. The cubic root of 873131985 is about 955.7844618486.

It can be divided in two parts, 87313 and 1985, that added together give a palindrome (89298).

The spelling of 873131985 in words is "eight hundred seventy-three million, one hundred thirty-one thousand, nine hundred eighty-five".