1113605631 has 16 divisors (see below), whose sum is σ = 1680916320. Its totient is φ = 728395200.

The previous prime is 1113605627. The next prime is 1113605641. The reversal of 1113605631 is 1365063111.

1113605631 is a `hidden beast` number, since 11 + 13 + 6 + 0 + 5 + 631 = 666.

It is not a de Polignac number, because 1113605631 - 2² = 1113605627 is a prime.

It is a super-2 number, since 2×1113605631² = 2480235002789816322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1113605595 and 1113605604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1113605611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 387670 + ... + 390531.

It is an arithmetic number, because the mean of its divisors is an integer number (105057270).

Almost surely, 2^1113605631 is an apocalyptic number.

1113605631 is a deficient number, since it is larger than the sum of its proper divisors (567310689).

1113605631 is an equidigital number, since it uses as much as digits as its factorization.

1113605631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778263 (or 778257 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 1113605631 is about 33370.7301538339. The cubic root of 1113605631 is about 1036.5186946475.

Adding to 1113605631 its reverse (1365063111), we get a palindrome (2478668742).

The spelling of 1113605631 in words is "one billion, one hundred thirteen million, six hundred five thousand, six hundred thirty-one".