864131 has 2 divisors, whose sum is σ = 864132. Its totient is φ = 864130.

The previous prime is 864121. The next prime is 864137. The reversal of 864131 is 131468.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864131 is a prime.

It is a super-2 number, since 2×864131² = 1493444770322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 864097 and 864106.

It is not a weakly prime, because it can be changed into another prime (864137) 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 as a sum of consecutive naturals, namely, 432065 + 432066.

It is an arithmetic number, because the mean of its divisors is an integer number (432066).

2⁸⁶⁴¹³¹ is an apocalyptic number.

864131 is a deficient number, since it is larger than the sum of its proper divisors (1).

864131 is an equidigital number, since it uses as much as digits as its factorization.

864131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 23.

The square root of 864131 is about 929.5864671993. The cubic root of 864131 is about 95.2488765215.

Adding to 864131 its reverse (131468), we get a palindrome (995599).

The spelling of 864131 in words is "eight hundred sixty-four thousand, one hundred thirty-one".