1131231863 has 4 divisors (see below), whose sum is σ = 1133065920. Its totient is φ = 1129397808.

The previous prime is 1131231859. The next prime is 1131231869. The reversal of 1131231863 is 3681321311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3681321311 = 2083 ⋅1767317.

It is a cyclic number.

It is not a de Polignac number, because 1131231863 - 2² = 1131231859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131231869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 916103 + ... + 917336.

It is an arithmetic number, because the mean of its divisors is an integer number (283266480).

Almost surely, 2^1131231863 is an apocalyptic number.

1131231863 is a deficient number, since it is larger than the sum of its proper divisors (1834057).

1131231863 is an equidigital number, since it uses as much as digits as its factorization.

1131231863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1834056.

The product of its digits is 2592, while the sum is 29.

The square root of 1131231863 is about 33633.7904940850. The cubic root of 1131231863 is about 1041.9587908273.

The spelling of 1131231863 in words is "one billion, one hundred thirty-one million, two hundred thirty-one thousand, eight hundred sixty-three".