201720769 has 2 divisors, whose sum is σ = 201720770. Its totient is φ = 201720768.

The previous prime is 201720767. The next prime is 201720821. The reversal of 201720769 is 967027102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130233744 + 71487025 = 11412^2 + 8455^2 .

It is a cyclic number.

It is not a de Polignac number, because 201720769 - 2¹ = 201720767 is a prime.

It is a super-2 number, since 2×201720769² = 81382537291902722, which contains 22 as substring.

Together with 201720767, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (201720763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100860384 + 100860385.

It is an arithmetic number, because the mean of its divisors is an integer number (100860385).

Almost surely, 2^201720769 is an apocalyptic number.

It is an amenable number.

201720769 is a deficient number, since it is larger than the sum of its proper divisors (1).

201720769 is an equidigital number, since it uses as much as digits as its factorization.

201720769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 201720769 is about 14202.8436941339. The cubic root of 201720769 is about 586.4759467793.

The spelling of 201720769 in words is "two hundred one million, seven hundred twenty thousand, seven hundred sixty-nine".