823131 has 6 divisors (see below), whose sum is σ = 1188980. Its totient is φ = 548748.

The previous prime is 823129. The next prime is 823153. The reversal of 823131 is 131328.

It is not a de Polignac number, because 823131 - 2¹ = 823129 is a prime.

It is a super-2 number, since 2×823131² = 1355089286322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (823231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45721 + ... + 45738.

2⁸²³¹³¹ is an apocalyptic number.

823131 is a deficient number, since it is larger than the sum of its proper divisors (365849).

823131 is a wasteful number, since it uses less digits than its factorization.

823131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91465 (or 91462 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 823131 is about 907.2656722262. The cubic root of 823131 is about 93.7179944081.

Adding to 823131 its reverse (131328), we get a palindrome (954459).

The spelling of 823131 in words is "eight hundred twenty-three thousand, one hundred thirty-one".