7975861 has 2 divisors, whose sum is σ = 7975862. Its totient is φ = 7975860.

The previous prime is 7975843. The next prime is 7975883. The reversal of 7975861 is 1685797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4384836 + 3591025 = 2094^2 + 1895^2 .

It is a cyclic number.

It is not a de Polignac number, because 7975861 - 2¹¹ = 7973813 is a prime.

It is a super-2 number, since 2×7975861² = 127228717382642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7976861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3987930 + 3987931.

It is an arithmetic number, because the mean of its divisors is an integer number (3987931).

Almost surely, 2^7975861 is an apocalyptic number.

It is an amenable number.

7975861 is a deficient number, since it is larger than the sum of its proper divisors (1).

7975861 is an equidigital number, since it uses as much as digits as its factorization.

7975861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 43.

The square root of 7975861 is about 2824.1566882877. The cubic root of 7975861 is about 199.7986390034.

Subtracting from 7975861 its reverse (1685797), we obtain a square (6290064 = 2508²).

It can be divided in two parts, 7975 and 861, that added together give a square (8836 = 94²).

The spelling of 7975861 in words is "seven million, nine hundred seventy-five thousand, eight hundred sixty-one".