71601611 has 4 divisors (see below), whose sum is σ = 72001800. Its totient is φ = 71201424.

The previous prime is 71601601. The next prime is 71601641. The reversal of 71601611 is 11610617.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71601611 is a prime.

It is a Duffinian number.

71601611 is a modest number, since divided by 1611 gives 716 as remainder.

It is not an unprimeable number, because it can be changed into a prime (71601601) 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, 199826 + ... + 200183.

It is an arithmetic number, because the mean of its divisors is an integer number (18000450).

Almost surely, 2^71601611 is an apocalyptic number.

71601611 is a deficient number, since it is larger than the sum of its proper divisors (400189).

71601611 is a wasteful number, since it uses less digits than its factorization.

71601611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400188.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 71601611 is about 8461.7735138681. The cubic root of 71601611 is about 415.2480464191.

The spelling of 71601611 in words is "seventy-one million, six hundred one thousand, six hundred eleven".