1123121531 has 8 divisors (see below), whose sum is σ = 1283785440. Its totient is φ = 962512128.

The previous prime is 1123121501. The next prime is 1123121543. The reversal of 1123121531 is 1351213211.

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 1123121531 - 2²⁶ = 1056012667 is a prime.

It is a super-2 number, since 2×1123121531² = 2522803946791567922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1123121501) 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, 50945 + ... + 69581.

It is an arithmetic number, because the mean of its divisors is an integer number (160473180).

Almost surely, 2^1123121531 is an apocalyptic number.

1123121531 is a deficient number, since it is larger than the sum of its proper divisors (160663909).

1123121531 is an equidigital number, since it uses as much as digits as its factorization.

1123121531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27253.

The product of its digits is 180, while the sum is 20.

The square root of 1123121531 is about 33513.0054008888. The cubic root of 1123121531 is about 1039.4627189663.

Adding to 1123121531 its reverse (1351213211), we get a palindrome (2474334742).

The spelling of 1123121531 in words is "one billion, one hundred twenty-three million, one hundred twenty-one thousand, five hundred thirty-one".