1046736721 has 4 divisors (see below), whose sum is σ = 1046815744. Its totient is φ = 1046657700.

The previous prime is 1046736709. The next prime is 1046736749. The reversal of 1046736721 is 1276376401.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1046736721 - 2¹⁷ = 1046605649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1046736221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14265 + ... + 47926.

It is an arithmetic number, because the mean of its divisors is an integer number (261703936).

Almost surely, 2^1046736721 is an apocalyptic number.

It is an amenable number.

1046736721 is a deficient number, since it is larger than the sum of its proper divisors (79023).

1046736721 is an equidigital number, since it uses as much as digits as its factorization.

1046736721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79022.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 1046736721 is about 32353.3108197600. The cubic root of 1046736721 is about 1015.3423165312.

The spelling of 1046736721 in words is "one billion, forty-six million, seven hundred thirty-six thousand, seven hundred twenty-one".