1815461 has 2 divisors, whose sum is σ = 1815462. Its totient is φ = 1815460.

The previous prime is 1815449. The next prime is 1815467. The reversal of 1815461 is 1645181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1366561 + 448900 = 1169^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 1815461 - 2⁶ = 1815397 is a prime.

It is a Sophie Germain 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 1815461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1815467) 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, 907730 + 907731.

It is an arithmetic number, because the mean of its divisors is an integer number (907731).

2^1815461 is an apocalyptic number.

It is an amenable number.

1815461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1815461 is an equidigital number, since it uses as much as digits as its factorization.

1815461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 26.

The square root of 1815461 is about 1347.3904408151. The cubic root of 1815461 is about 121.9913323592.

The spelling of 1815461 in words is "one million, eight hundred fifteen thousand, four hundred sixty-one".