1131242123 has 8 divisors (see below), whose sum is σ = 1257367536. Its totient is φ = 1008997600.

The previous prime is 1131242113. The next prime is 1131242129. The reversal of 1131242123 is 3212421311.

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 1131242123 - 2⁶ = 1131242059 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1131242095 and 1131242104.

It is not an unprimeable number, because it can be changed into a prime (1131242129) 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, 969608 + ... + 970773.

It is an arithmetic number, because the mean of its divisors is an integer number (157170942).

Almost surely, 2^1131242123 is an apocalyptic number.

1131242123 is a deficient number, since it is larger than the sum of its proper divisors (126125413).

1131242123 is a wasteful number, since it uses less digits than its factorization.

1131242123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1940445.

The product of its digits is 288, while the sum is 20.

The square root of 1131242123 is about 33633.9430189206. The cubic root of 1131242123 is about 1041.9619409227.

Adding to 1131242123 its reverse (3212421311), we get a palindrome (4343663434).

It can be divided in two parts, 11312 and 42123, that added together give a palindrome (53435).

The spelling of 1131242123 in words is "one billion, one hundred thirty-one million, two hundred forty-two thousand, one hundred twenty-three".