863131 has 2 divisors, whose sum is σ = 863132. Its totient is φ = 863130.

The previous prime is 863123. The next prime is 863143. The reversal of 863131 is 131368.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 863131 - 2³ = 863123 is a prime.

It is a super-2 number, since 2×863131² = 1489990246322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (863231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431565 + 431566.

It is an arithmetic number, because the mean of its divisors is an integer number (431566).

2⁸⁶³¹³¹ is an apocalyptic number.

863131 is a deficient number, since it is larger than the sum of its proper divisors (1).

863131 is an equidigital number, since it uses as much as digits as its factorization.

863131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 22.

The square root of 863131 is about 929.0484379191. The cubic root of 863131 is about 95.2121206586.

Adding to 863131 its reverse (131368), we get a palindrome (994499).

The spelling of 863131 in words is "eight hundred sixty-three thousand, one hundred thirty-one".