1123951285 has 4 divisors (see below), whose sum is σ = 1348741548. Its totient is φ = 899161024.

The previous prime is 1123951273. The next prime is 1123951303. The reversal of 1123951285 is 5821593211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5821593211 = 7 ⋅831656173.

It can be written as a sum of positive squares in 2 ways, for example, as 683874801 + 440076484 = 26151^2 + 20978^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123951285 - 2¹⁷ = 1123820213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112395124 + ... + 112395133.

It is an arithmetic number, because the mean of its divisors is an integer number (337185387).

Almost surely, 2^1123951285 is an apocalyptic number.

It is an amenable number.

1123951285 is a deficient number, since it is larger than the sum of its proper divisors (224790263).

1123951285 is an equidigital number, since it uses as much as digits as its factorization.

1123951285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224790262.

The product of its digits is 21600, while the sum is 37.

The square root of 1123951285 is about 33525.3826972937. The cubic root of 1123951285 is about 1039.7186384460.

The spelling of 1123951285 in words is "one billion, one hundred twenty-three million, nine hundred fifty-one thousand, two hundred eighty-five".