1001720071 has 16 divisors (see below), whose sum is σ = 1174786560. Its totient is φ = 844361280.

The previous prime is 1001720051. The next prime is 1001720123. The reversal of 1001720071 is 1700271001.

1001720071 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1001720071 - 2⁵ = 1001720039 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001720051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41166 + ... + 60811.

It is an arithmetic number, because the mean of its divisors is an integer number (73424160).

Almost surely, 2^1001720071 is an apocalyptic number.

1001720071 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1001720071 is a deficient number, since it is larger than the sum of its proper divisors (173066489).

1001720071 is a wasteful number, since it uses less digits than its factorization.

1001720071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102054.

The product of its (nonzero) digits is 98, while the sum is 19.

The square root of 1001720071 is about 31649.9616271489. The cubic root of 1001720071 is about 1000.5730285755.

Adding to 1001720071 its reverse (1700271001), we get a palindrome (2701991072).

The spelling of 1001720071 in words is "one billion, one million, seven hundred twenty thousand, seventy-one".