1131223123 has 8 divisors (see below), whose sum is σ = 1137855600. Its totient is φ = 1124610720.

The previous prime is 1131223103. The next prime is 1131223127. The reversal of 1131223123 is 3213221311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1131223123 - 2⁵ = 1131223091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1131223123.

It is not an unprimeable number, because it can be changed into a prime (1131223127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116433 + ... + 125773.

It is an arithmetic number, because the mean of its divisors is an integer number (142231950).

Almost surely, 2^1131223123 is an apocalyptic number.

1131223123 is a deficient number, since it is larger than the sum of its proper divisors (6632477).

1131223123 is an equidigital number, since it uses as much as digits as its factorization.

1131223123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10037.

The product of its digits is 216, while the sum is 19.

The square root of 1131223123 is about 33633.6605649757. The cubic root of 1131223123 is about 1041.9561073977.

Adding to 1131223123 its reverse (3213221311), we get a palindrome (4344444434).

It can be divided in two parts, 113 and 1223123, that added together give a square (1223236 = 1106²).

The spelling of 1131223123 in words is "one billion, one hundred thirty-one million, two hundred twenty-three thousand, one hundred twenty-three".