7999561 has 8 divisors (see below), whose sum is σ = 8383680. Its totient is φ = 7618512.

The previous prime is 7999547. The next prime is 7999573. The reversal of 7999561 is 1659997.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7999561 - 2¹³ = 7991369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7999501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5895 + ... + 7123.

It is an arithmetic number, because the mean of its divisors is an integer number (1047960).

Almost surely, 2^7999561 is an apocalyptic number.

It is an amenable number.

7999561 is a deficient number, since it is larger than the sum of its proper divisors (384119).

7999561 is a wasteful number, since it uses less digits than its factorization.

7999561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535.

The product of its digits is 153090, while the sum is 46.

The square root of 7999561 is about 2828.3495187123. The cubic root of 7999561 is about 199.9963415997.

The spelling of 7999561 in words is "seven million, nine hundred ninety-nine thousand, five hundred sixty-one".