7821461 has 2 divisors, whose sum is σ = 7821462. Its totient is φ = 7821460.

The previous prime is 7821427. The next prime is 7821469. The reversal of 7821461 is 1641287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6791236 + 1030225 = 2606^2 + 1015^2 .

It is a cyclic number.

It is not a de Polignac number, because 7821461 - 2⁶ = 7821397 is a prime.

It is a super-2 number, since 2×7821461² = 122350504349042, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7821469) 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, 3910730 + 3910731.

It is an arithmetic number, because the mean of its divisors is an integer number (3910731).

Almost surely, 2^7821461 is an apocalyptic number.

It is an amenable number.

7821461 is a deficient number, since it is larger than the sum of its proper divisors (1).

7821461 is an equidigital number, since it uses as much as digits as its factorization.

7821461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 29.

The square root of 7821461 is about 2796.6875048886. The cubic root of 7821461 is about 198.5009675796.

The spelling of 7821461 in words is "seven million, eight hundred twenty-one thousand, four hundred sixty-one".