71681601 has 8 divisors (see below), whose sum is σ = 95635744. Its totient is φ = 47757600.

The previous prime is 71681587. The next prime is 71681609. The reversal of 71681601 is 10618617.

It is a happy number.

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

It is not a de Polignac number, because 71681601 - 2⁵ = 71681569 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71681609) 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, 1231 + ... + 12036.

It is an arithmetic number, because the mean of its divisors is an integer number (11954468).

Almost surely, 2^71681601 is an apocalyptic number.

It is an amenable number.

71681601 is a deficient number, since it is larger than the sum of its proper divisors (23954143).

71681601 is a wasteful number, since it uses less digits than its factorization.

71681601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15071.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 71681601 is about 8466.4987450539. The cubic root of 71681601 is about 415.4026208271.

The spelling of 71681601 in words is "seventy-one million, six hundred eighty-one thousand, six hundred one".