1153243121 has 32 divisors (see below), whose sum is σ = 1268628480. Its totient is φ = 1045785600.

The previous prime is 1153243103. The next prime is 1153243139. The reversal of 1153243121 is 1213423511.

It is an interprime number because it is at equal distance from previous prime (1153243103) and next prime (1153243139).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1153243121 is a prime.

It is a super-2 number, since 2×1153243121² = 2659939392267641282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1153243141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6442610 + ... + 6442788.

It is an arithmetic number, because the mean of its divisors is an integer number (39644640).

Almost surely, 2^1153243121 is an apocalyptic number.

It is an amenable number.

1153243121 is a deficient number, since it is larger than the sum of its proper divisors (115385359).

1153243121 is a wasteful number, since it uses less digits than its factorization.

1153243121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425.

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

The square root of 1153243121 is about 33959.4334611165. The cubic root of 1153243121 is about 1048.6734937369.

Adding to 1153243121 its reverse (1213423511), we get a palindrome (2366666632).

The spelling of 1153243121 in words is "one billion, one hundred fifty-three million, two hundred forty-three thousand, one hundred twenty-one".