1047001721 has 4 divisors (see below), whose sum is σ = 1047123792. Its totient is φ = 1046879652.

The previous prime is 1047001687. The next prime is 1047001723. The reversal of 1047001721 is 1271007401.

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.

It is a cyclic number.

It is not a de Polignac number, because 1047001721 - 2¹⁰ = 1047000697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1047001723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47111 + ... + 65676.

It is an arithmetic number, because the mean of its divisors is an integer number (261780948).

Almost surely, 2^1047001721 is an apocalyptic number.

It is an amenable number.

1047001721 is a deficient number, since it is larger than the sum of its proper divisors (122071).

1047001721 is an equidigital number, since it uses as much as digits as its factorization.

1047001721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122070.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 1047001721 is about 32357.4059683405. The cubic root of 1047001721 is about 1015.4279932843.

The spelling of 1047001721 in words is "one billion, forty-seven million, one thousand, seven hundred twenty-one".