18821701 has 2 divisors, whose sum is σ = 18821702. Its totient is φ = 18821700.

The previous prime is 18821689. The next prime is 18821711. The reversal of 18821701 is 10712881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11390625 + 7431076 = 3375^2 + 2726^2 .

It is a cyclic number.

It is not a de Polignac number, because 18821701 - 2¹¹ = 18819653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18821701.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18821711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9410850 + 9410851.

It is an arithmetic number, because the mean of its divisors is an integer number (9410851).

Almost surely, 2^18821701 is an apocalyptic number.

It is an amenable number.

18821701 is a deficient number, since it is larger than the sum of its proper divisors (1).

18821701 is an equidigital number, since it uses as much as digits as its factorization.

18821701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 18821701 is about 4338.3984372116. The cubic root of 18821701 is about 266.0028501400.

The spelling of 18821701 in words is "eighteen million, eight hundred twenty-one thousand, seven hundred one".