814113721 has 2 divisors, whose sum is σ = 814113722. Its totient is φ = 814113720.

The previous prime is 814113667. The next prime is 814113733. The reversal of 814113721 is 127311418.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 712890000 + 101223721 = 26700^2 + 10061^2 .

It is a cyclic number.

It is not a de Polignac number, because 814113721 - 2¹³ = 814105529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 814113721.

It is not a weakly prime, because it can be changed into another prime (814113821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407056860 + 407056861.

It is an arithmetic number, because the mean of its divisors is an integer number (407056861).

Almost surely, 2^814113721 is an apocalyptic number.

It is an amenable number.

814113721 is a deficient number, since it is larger than the sum of its proper divisors (1).

814113721 is an equidigital number, since it uses as much as digits as its factorization.

814113721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 28.

The square root of 814113721 is about 28532.6781252654. The cubic root of 814113721 is about 933.7451480160.

The spelling of 814113721 in words is "eight hundred fourteen million, one hundred thirteen thousand, seven hundred twenty-one".