815045447 has 2 divisors, whose sum is σ = 815045448. Its totient is φ = 815045446.

The previous prime is 815045393. The next prime is 815045453. The reversal of 815045447 is 744540518.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-815045447 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 815045447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (815045747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407522723 + 407522724.

It is an arithmetic number, because the mean of its divisors is an integer number (407522724).

Almost surely, 2^815045447 is an apocalyptic number.

815045447 is a deficient number, since it is larger than the sum of its proper divisors (1).

815045447 is an equidigital number, since it uses as much as digits as its factorization.

815045447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 89600, while the sum is 38.

The square root of 815045447 is about 28549.0008056324. Note that the first 3 decimals coincide. The cubic root of 815045447 is about 934.1012256036.

The spelling of 815045447 in words is "eight hundred fifteen million, forty-five thousand, four hundred forty-seven".