71634081 has 4 divisors (see below), whose sum is σ = 95512112. Its totient is φ = 47756052.

The previous prime is 71634077. The next prime is 71634091. The reversal of 71634081 is 18043617.

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 not a de Polignac number, because 71634081 - 2² = 71634077 is a prime.

It is a super-2 number, since 2×71634081² = 10262883121429122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71634041) 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, 11939011 + ... + 11939016.

It is an arithmetic number, because the mean of its divisors is an integer number (23878028).

Almost surely, 2^71634081 is an apocalyptic number.

It is an amenable number.

71634081 is a deficient number, since it is larger than the sum of its proper divisors (23878031).

71634081 is a wasteful number, since it uses less digits than its factorization.

71634081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23878030.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 71634081 is about 8463.6919249226. The cubic root of 71634081 is about 415.3108060241.

Adding to 71634081 its reverse (18043617), we get a palindrome (89677698).

The spelling of 71634081 in words is "seventy-one million, six hundred thirty-four thousand, eighty-one".