7885561 has 4 divisors (see below), whose sum is σ = 7892352. Its totient is φ = 7878772.

The previous prime is 7885547. The next prime is 7885567. The reversal of 7885561 is 1655887.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 7885561 - 2¹³ = 7877369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7885567) 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 in 3 ways as a sum of consecutive naturals, for example, 1165 + ... + 4138.

It is an arithmetic number, because the mean of its divisors is an integer number (1973088).

Almost surely, 2^7885561 is an apocalyptic number.

It is an amenable number.

7885561 is a deficient number, since it is larger than the sum of its proper divisors (6791).

7885561 is a wasteful number, since it uses less digits than its factorization.

7885561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6790.

The product of its digits is 67200, while the sum is 40.

The square root of 7885561 is about 2808.1241069440. The cubic root of 7885561 is about 199.0417578590.

The spelling of 7885561 in words is "seven million, eight hundred eighty-five thousand, five hundred sixty-one".