71606621 has 4 divisors (see below), whose sum is σ = 73916544. Its totient is φ = 69296700.

The previous prime is 71606617. The next prime is 71606651. The reversal of 71606621 is 12660617.

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 a cyclic number.

It is not a de Polignac number, because 71606621 - 2² = 71606617 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 (71606651) 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 3 ways as a sum of consecutive naturals, for example, 1154915 + ... + 1154976.

It is an arithmetic number, because the mean of its divisors is an integer number (18479136).

Almost surely, 2^71606621 is an apocalyptic number.

It is an amenable number.

71606621 is a deficient number, since it is larger than the sum of its proper divisors (2309923).

71606621 is a wasteful number, since it uses less digits than its factorization.

71606621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2309922.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 71606621 is about 8462.0695459208. The cubic root of 71606621 is about 415.2577312300.

It can be divided in two parts, 71606 and 621, that added together give a palindrome (72227).

The spelling of 71606621 in words is "seventy-one million, six hundred six thousand, six hundred twenty-one".