71601561 has 12 divisors (see below), whose sum is σ = 103653888. Its totient is φ = 47628504.

The previous prime is 71601533. The next prime is 71601601. The reversal of 71601561 is 16510617.

71601561 is a `hidden beast` number, since 7 + 1 + 601 + 56 + 1 = 666.

It is not a de Polignac number, because 71601561 - 2⁵ = 71601529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71601961) 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 in 11 ways as a sum of consecutive naturals, for example, 4425 + ... + 12758.

It is an arithmetic number, because the mean of its divisors is an integer number (8637824).

Almost surely, 2^71601561 is an apocalyptic number.

It is an amenable number.

71601561 is a deficient number, since it is larger than the sum of its proper divisors (32052327).

71601561 is a wasteful number, since it uses less digits than its factorization.

71601561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17652 (or 17649 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 71601561 is about 8461.7705594042. The cubic root of 71601561 is about 415.2479497620.

The spelling of 71601561 in words is "seventy-one million, six hundred one thousand, five hundred sixty-one".