1123205631 has 4 divisors (see below), whose sum is σ = 1497607512. Its totient is φ = 748803752.

The previous prime is 1123205561. The next prime is 1123205639. The reversal of 1123205631 is 1365023211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1123205631 - 2¹⁵ = 1123172863 is a prime.

It is a super-2 number, since 2×1123205631² = 2523181779020216322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123205639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187200936 + ... + 187200941.

It is an arithmetic number, because the mean of its divisors is an integer number (374401878).

Almost surely, 2^1123205631 is an apocalyptic number.

1123205631 is a deficient number, since it is larger than the sum of its proper divisors (374401881).

1123205631 is an equidigital number, since it uses as much as digits as its factorization.

1123205631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374401880.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 1123205631 is about 33514.2601141663. The cubic root of 1123205631 is about 1039.4886635117.

Adding to 1123205631 its reverse (1365023211), we get a palindrome (2488228842).

The spelling of 1123205631 in words is "one billion, one hundred twenty-three million, two hundred five thousand, six hundred thirty-one".