1121231123 has 4 divisors (see below), whose sum is σ = 1122617880. Its totient is φ = 1119844368.

The previous prime is 1121231113. The next prime is 1121231143. The reversal of 1121231123 is 3211321211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1121231123 - 2¹⁴ = 1121214739 is a prime.

It is a super-2 number, since 2×1121231123² = 2514318462367682258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121231113) 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, 692165 + ... + 693782.

It is an arithmetic number, because the mean of its divisors is an integer number (280654470).

Almost surely, 2^1121231123 is an apocalyptic number.

1121231123 is a deficient number, since it is larger than the sum of its proper divisors (1386757).

1121231123 is an equidigital number, since it uses as much as digits as its factorization.

1121231123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386756.

The product of its digits is 72, while the sum is 17.

The square root of 1121231123 is about 33484.7894274400. The cubic root of 1121231123 is about 1038.8791928739.

Adding to 1121231123 its reverse (3211321211), we get a palindrome (4332552334).

The spelling of 1121231123 in words is "one billion, one hundred twenty-one million, two hundred thirty-one thousand, one hundred twenty-three".