815949941 has 2 divisors, whose sum is σ = 815949942. Its totient is φ = 815949940.

The previous prime is 815949931. The next prime is 815949971. The reversal of 815949941 is 149949518.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 464574916 + 351375025 = 21554^2 + 18745^2 .

It is a cyclic number.

It is not a de Polignac number, because 815949941 - 2²⁶ = 748841077 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 815949941.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (815949931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407974970 + 407974971.

It is an arithmetic number, because the mean of its divisors is an integer number (407974971).

Almost surely, 2^815949941 is an apocalyptic number.

It is an amenable number.

815949941 is a deficient number, since it is larger than the sum of its proper divisors (1).

815949941 is an equidigital number, since it uses as much as digits as its factorization.

815949941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 50.

The square root of 815949941 is about 28564.8374929738. The cubic root of 815949941 is about 934.4466364483.

The spelling of 815949941 in words is "eight hundred fifteen million, nine hundred forty-nine thousand, nine hundred forty-one".