1011721723 has 8 divisors (see below), whose sum is σ = 1065961728. Its totient is φ = 958336104.

The previous prime is 1011721721. The next prime is 1011721741. The reversal of 1011721723 is 3271271101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1011721723 - 2¹ = 1011721721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011721721) 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 7 ways as a sum of consecutive naturals, for example, 211165 + ... + 215902.

It is an arithmetic number, because the mean of its divisors is an integer number (133245216).

Almost surely, 2^1011721723 is an apocalyptic number.

1011721723 is a deficient number, since it is larger than the sum of its proper divisors (54240005).

1011721723 is a wasteful number, since it uses less digits than its factorization.

1011721723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427193.

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 1011721723 is about 31807.5733591860. The cubic root of 1011721723 is about 1003.8920731142.

Adding to 1011721723 its reverse (3271271101), we get a palindrome (4282992824).

The spelling of 1011721723 in words is "one billion, eleven million, seven hundred twenty-one thousand, seven hundred twenty-three".