1123451985 has 32 divisors (see below), whose sum is σ = 1811202048. Its totient is φ = 594636480.

The previous prime is 1123451983. The next prime is 1123451999. The reversal of 1123451985 is 5891543211.

It is not a de Polignac number, because 1123451985 - 2¹ = 1123451983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1123451983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1625490 + ... + 1626180.

It is an arithmetic number, because the mean of its divisors is an integer number (56600064).

Almost surely, 2^1123451985 is an apocalyptic number.

1123451985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1123451985 is a deficient number, since it is larger than the sum of its proper divisors (687750063).

1123451985 is a wasteful number, since it uses less digits than its factorization.

1123451985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1365.

The product of its digits is 43200, while the sum is 39.

The square root of 1123451985 is about 33517.9352735218. The cubic root of 1123451985 is about 1039.5646553762.

The spelling of 1123451985 in words is "one billion, one hundred twenty-three million, four hundred fifty-one thousand, nine hundred eighty-five".