1721061071 has 2 divisors, whose sum is σ = 1721061072. Its totient is φ = 1721061070.

The previous prime is 1721061061. The next prime is 1721061143. The reversal of 1721061071 is 1701601271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1721061071 - 2¹⁴ = 1721044687 is a prime.

It is a super-2 number, since 2×1721061071² = 5924102420223334082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1721061071.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1721061061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860530535 + 860530536.

It is an arithmetic number, because the mean of its divisors is an integer number (860530536).

Almost surely, 2^1721061071 is an apocalyptic number.

1721061071 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721061071 is an equidigital number, since it uses as much as digits as its factorization.

1721061071 is an evil number, because the sum of its binary digits is even.

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

The square root of 1721061071 is about 41485.6730811976. The cubic root of 1721061071 is about 1198.3916116374.

The spelling of 1721061071 in words is "one billion, seven hundred twenty-one million, sixty-one thousand, seventy-one".