71351661 has 4 divisors (see below), whose sum is σ = 95135552. Its totient is φ = 47567772.

The previous prime is 71351659. The next prime is 71351689. The reversal of 71351661 is 16615317.

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 71351661 - 2¹ = 71351659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71351461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11891941 + ... + 11891946.

It is an arithmetic number, because the mean of its divisors is an integer number (23783888).

Almost surely, 2^71351661 is an apocalyptic number.

It is an amenable number.

71351661 is a deficient number, since it is larger than the sum of its proper divisors (23783891).

71351661 is a wasteful number, since it uses less digits than its factorization.

71351661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23783890.

The product of its digits is 3780, while the sum is 30.

The square root of 71351661 is about 8446.9912394888. The cubic root of 71351661 is about 414.7642944685.

Adding to 71351661 its reverse (16615317), we get a palindrome (87966978).

The spelling of 71351661 in words is "seventy-one million, three hundred fifty-one thousand, six hundred sixty-one".