8071561 has 4 divisors (see below), whose sum is σ = 8496400. Its totient is φ = 7646724.

The previous prime is 8071519. The next prime is 8071601. The reversal of 8071561 is 1651708.

It is a happy number.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8071561 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8071061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212391 + ... + 212428.

It is an arithmetic number, because the mean of its divisors is an integer number (2124100).

Almost surely, 2^8071561 is an apocalyptic number.

It is an amenable number.

8071561 is a deficient number, since it is larger than the sum of its proper divisors (424839).

8071561 is a wasteful number, since it uses less digits than its factorization.

8071561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424838.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 8071561 is about 2841.0492779957. The cubic root of 8071561 is about 200.5945723338.

The spelling of 8071561 in words is "eight million, seventy-one thousand, five hundred sixty-one".