1681730101 has 2 divisors, whose sum is σ = 1681730102. Its totient is φ = 1681730100.

The previous prime is 1681730051. The next prime is 1681730119. The reversal of 1681730101 is 1010371861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1462986001 + 218744100 = 38249^2 + 14790^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681730101 - 2²¹ = 1679632949 is a prime.

It is a super-2 number, since 2×1681730101² = 5656432265218940402, 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 1681730101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1681730161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840865050 + 840865051.

It is an arithmetic number, because the mean of its divisors is an integer number (840865051).

Almost surely, 2^1681730101 is an apocalyptic number.

It is an amenable number.

1681730101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681730101 is an equidigital number, since it uses as much as digits as its factorization.

1681730101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 1681730101 is about 41008.9027041690. The cubic root of 1681730101 is about 1189.1923293322.

The spelling of 1681730101 in words is "one billion, six hundred eighty-one million, seven hundred thirty thousand, one hundred one".