9811801 has 2 divisors, whose sum is σ = 9811802. Its totient is φ = 9811800.

The previous prime is 9811757. The next prime is 9811811. The reversal of 9811801 is 1081189.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9000000 + 811801 = 3000^2 + 901^2 .

It is a cyclic number.

It is not a de Polignac number, because 9811801 - 2²¹ = 7714649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9811801.

It is not a weakly prime, because it can be changed into another prime (9811811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4905900 + 4905901.

It is an arithmetic number, because the mean of its divisors is an integer number (4905901).

Almost surely, 2^9811801 is an apocalyptic number.

It is an amenable number.

9811801 is a deficient number, since it is larger than the sum of its proper divisors (1).

9811801 is an equidigital number, since it uses as much as digits as its factorization.

9811801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 28.

The square root of 9811801 is about 3132.3794470019. The cubic root of 9811801 is about 214.0833590876.

It can be divided in two parts, 9 and 811801, that multiplied together give a square (7306209 = 2703²).

The spelling of 9811801 in words is "nine million, eight hundred eleven thousand, eight hundred one".