1123145321 has 8 divisors (see below), whose sum is σ = 1179217920. Its totient is φ = 1068229008.

The previous prime is 1123145297. The next prime is 1123145329. The reversal of 1123145321 is 1235413211.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123145321 is a prime.

It is a super-2 number, since 2×1123145321² = 2522910824168386082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123145329) 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, 287081 + ... + 290966.

It is an arithmetic number, because the mean of its divisors is an integer number (147402240).

Almost surely, 2^1123145321 is an apocalyptic number.

It is an amenable number.

1123145321 is a deficient number, since it is larger than the sum of its proper divisors (56072599).

1123145321 is an equidigital number, since it uses as much as digits as its factorization.

1123145321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578143.

The product of its digits is 720, while the sum is 23.

The square root of 1123145321 is about 33513.3603358422. The cubic root of 1123145321 is about 1039.4700582265.

Adding to 1123145321 its reverse (1235413211), we get a palindrome (2358558532).

The spelling of 1123145321 in words is "one billion, one hundred twenty-three million, one hundred forty-five thousand, three hundred twenty-one".