1100431681 has 4 divisors (see below), whose sum is σ = 1102057812. Its totient is φ = 1098805552.

The previous prime is 1100431639. The next prime is 1100431691. The reversal of 1100431681 is 1861340011.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1075840000 + 24591681 = 32800^2 + 4959^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1100431681 is a prime.

It is a super-2 number, since 2×1100431681² = 2421899769096971522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1100431691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 812050 + ... + 813403.

It is an arithmetic number, because the mean of its divisors is an integer number (275514453).

Almost surely, 2^1100431681 is an apocalyptic number.

It is an amenable number.

1100431681 is a deficient number, since it is larger than the sum of its proper divisors (1626131).

1100431681 is an equidigital number, since it uses as much as digits as its factorization.

1100431681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1626130.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1100431681 is about 33172.7551011368. The cubic root of 1100431681 is about 1032.4151328604.

Adding to 1100431681 its reverse (1861340011), we get a palindrome (2961771692).

The spelling of 1100431681 in words is "one billion, one hundred million, four hundred thirty-one thousand, six hundred eighty-one".