815343649 has 2 divisors, whose sum is σ = 815343650. Its totient is φ = 815343648.

The previous prime is 815343601. The next prime is 815343673. The reversal of 815343649 is 946343518.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 586366225 + 228977424 = 24215^2 + 15132^2 .

It is a cyclic number.

It is not a de Polignac number, because 815343649 - 2⁷ = 815343521 is a prime.

It is a super-3 number, since 3×815343649³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (815343349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407671824 + 407671825.

It is an arithmetic number, because the mean of its divisors is an integer number (407671825).

Almost surely, 2^815343649 is an apocalyptic number.

It is an amenable number.

815343649 is a deficient number, since it is larger than the sum of its proper divisors (1).

815343649 is an equidigital number, since it uses as much as digits as its factorization.

815343649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 43.

The square root of 815343649 is about 28554.2229626372. Note that the first 3 decimals coincide. The cubic root of 815343649 is about 934.2151320900.

The spelling of 815343649 in words is "eight hundred fifteen million, three hundred forty-three thousand, six hundred forty-nine".