7875661 has 2 divisors, whose sum is σ = 7875662. Its totient is φ = 7875660.

The previous prime is 7875653. The next prime is 7875667. The reversal of 7875661 is 1665787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7873636 + 2025 = 2806^2 + 45^2 .

It is a cyclic number.

It is not a de Polignac number, because 7875661 - 2³ = 7875653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7875667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3937830 + 3937831.

It is an arithmetic number, because the mean of its divisors is an integer number (3937831).

Almost surely, 2^7875661 is an apocalyptic number.

It is an amenable number.

7875661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7875661 is an equidigital number, since it uses as much as digits as its factorization.

7875661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 40.

The square root of 7875661 is about 2806.3608107298. The cubic root of 7875661 is about 198.9584267085.

The spelling of 7875661 in words is "seven million, eight hundred seventy-five thousand, six hundred sixty-one".