1087721743 has 4 divisors (see below), whose sum is σ = 1092273120. Its totient is φ = 1083170368.

The previous prime is 1087721731. The next prime is 1087721749. The reversal of 1087721743 is 3471277801.

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 1087721743 - 2⁹ = 1087721231 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1087721696 and 1087721705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1087721749) 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 3 ways as a sum of consecutive naturals, for example, 2275330 + ... + 2275807.

It is an arithmetic number, because the mean of its divisors is an integer number (273068280).

Almost surely, 2^1087721743 is an apocalyptic number.

1087721743 is a deficient number, since it is larger than the sum of its proper divisors (4551377).

1087721743 is an equidigital number, since it uses as much as digits as its factorization.

1087721743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4551376.

The product of its (nonzero) digits is 65856, while the sum is 40.

The square root of 1087721743 is about 32980.6267830070. The cubic root of 1087721743 is about 1028.4249477700.

The spelling of 1087721743 in words is "one billion, eighty-seven million, seven hundred twenty-one thousand, seven hundred forty-three".