1123456621 has 16 divisors (see below), whose sum is σ = 1317294720. Its totient is φ = 938027520.

The previous prime is 1123456601. The next prime is 1123456627. The reversal of 1123456621 is 1266543211.

It is a happy number.

It is not a de Polignac number, because 1123456621 - 2⁵ = 1123456589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123456627) 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 15 ways as a sum of consecutive naturals, for example, 209445 + ... + 214741.

It is an arithmetic number, because the mean of its divisors is an integer number (82330920).

Almost surely, 2^1123456621 is an apocalyptic number.

It is an amenable number.

1123456621 is a deficient number, since it is larger than the sum of its proper divisors (193838099).

1123456621 is an equidigital number, since it uses as much as digits as its factorization.

1123456621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6084.

The product of its digits is 8640, while the sum is 31.

The square root of 1123456621 is about 33518.0044304550. The cubic root of 1123456621 is about 1039.5660853187.

Adding to 1123456621 its reverse (1266543211), we get a palindrome (2389999832).

The spelling of 1123456621 in words is "one billion, one hundred twenty-three million, four hundred fifty-six thousand, six hundred twenty-one".