815390461 has 2 divisors, whose sum is σ = 815390462. Its totient is φ = 815390460.

The previous prime is 815390449. The next prime is 815390501. The reversal of 815390461 is 164093518.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 802645561 + 12744900 = 28331^2 + 3570^2 .

It is a cyclic number.

It is not a de Polignac number, because 815390461 - 2²⁷ = 681172733 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 815390461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (815390441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407695230 + 407695231.

It is an arithmetic number, because the mean of its divisors is an integer number (407695231).

Almost surely, 2^815390461 is an apocalyptic number.

It is an amenable number.

815390461 is a deficient number, since it is larger than the sum of its proper divisors (1).

815390461 is an equidigital number, since it uses as much as digits as its factorization.

815390461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 815390461 is about 28555.0426544945. The cubic root of 815390461 is about 934.2330107034.

The spelling of 815390461 in words is "eight hundred fifteen million, three hundred ninety thousand, four hundred sixty-one".