811421701 has 2 divisors, whose sum is σ = 811421702. Its totient is φ = 811421700.

The previous prime is 811421659. The next prime is 811421707. The reversal of 811421701 is 107124118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 674648676 + 136773025 = 25974^2 + 11695^2 .

It is a cyclic number.

It is not a de Polignac number, because 811421701 - 2¹³ = 811413509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (811421707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405710850 + 405710851.

It is an arithmetic number, because the mean of its divisors is an integer number (405710851).

Almost surely, 2^811421701 is an apocalyptic number.

It is an amenable number.

811421701 is a deficient number, since it is larger than the sum of its proper divisors (1).

811421701 is an equidigital number, since it uses as much as digits as its factorization.

811421701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 25.

The square root of 811421701 is about 28485.4647320348. The cubic root of 811421701 is about 932.7148102471.

Adding to 811421701 its reverse (107124118), we get a palindrome (918545819).

The spelling of 811421701 in words is "eight hundred eleven million, four hundred twenty-one thousand, seven hundred one".