1061721071 has 4 divisors (see below), whose sum is σ = 1069825944. Its totient is φ = 1053616200.

The previous prime is 1061721029. The next prime is 1061721097. The reversal of 1061721071 is 1701271601.

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 1061721071 - 2¹⁴ = 1061704687 is a prime.

It is a super-2 number, since 2×1061721071² = 2254503265210774082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1061721071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1061721571) 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, 4052240 + ... + 4052501.

It is an arithmetic number, because the mean of its divisors is an integer number (267456486).

Almost surely, 2^1061721071 is an apocalyptic number.

1061721071 is a deficient number, since it is larger than the sum of its proper divisors (8104873).

1061721071 is an equidigital number, since it uses as much as digits as its factorization.

1061721071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8104872.

The product of its (nonzero) digits is 588, while the sum is 26.

The square root of 1061721071 is about 32584.0616099344. The cubic root of 1061721071 is about 1020.1643561246.

Adding to 1061721071 its reverse (1701271601), we get a palindrome (2762992672).

The spelling of 1061721071 in words is "one billion, sixty-one million, seven hundred twenty-one thousand, seventy-one".