71563613 has 4 divisors (see below), whose sum is σ = 78069408. Its totient is φ = 65057820.

The previous prime is 71563607. The next prime is 71563631. The reversal of 71563613 is 31636517.

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 71563613 - 2¹⁸ = 71301469 is a prime.

It is a super-2 number, since 2×71563613² = 10242701411227538, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 71563613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71563643) 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, 3252881 + ... + 3252902.

It is an arithmetic number, because the mean of its divisors is an integer number (19517352).

Almost surely, 2^71563613 is an apocalyptic number.

It is an amenable number.

71563613 is a deficient number, since it is larger than the sum of its proper divisors (6505795).

71563613 is a wasteful number, since it uses less digits than its factorization.

71563613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6505794.

The product of its digits is 11340, while the sum is 32.

The square root of 71563613 is about 8459.5279419126. The cubic root of 71563613 is about 415.1745779266.

The spelling of 71563613 in words is "seventy-one million, five hundred sixty-three thousand, six hundred thirteen".