823693131 has 20 divisors (see below), whose sum is σ = 1244291400. Its totient is φ = 542954016.

The previous prime is 823693127. The next prime is 823693139. The reversal of 823693131 is 131396328.

It is not a de Polignac number, because 823693131 - 2² = 823693127 is a prime.

It is a super-2 number, since 2×823693131² = 1356940748113166322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (823693139) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 49921 + ... + 64338.

It is an arithmetic number, because the mean of its divisors is an integer number (62214570).

Almost surely, 2^823693131 is an apocalyptic number.

823693131 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

823693131 is a deficient number, since it is larger than the sum of its proper divisors (420598269).

823693131 is a wasteful number, since it uses less digits than its factorization.

823693131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114360 (or 114351 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 823693131 is about 28700.0545469865. The cubic root of 823693131 is about 937.3932345617.

The spelling of 823693131 in words is "eight hundred twenty-three million, six hundred ninety-three thousand, one hundred thirty-one".