71220613 has 4 divisors (see below), whose sum is σ = 71277408. Its totient is φ = 71163820.

The previous prime is 71220593. The next prime is 71220619. The reversal of 71220613 is 31602217.

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 71220613 - 2⁹ = 71220101 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 (71220619) 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, 26473 + ... + 29038.

It is an arithmetic number, because the mean of its divisors is an integer number (17819352).

Almost surely, 2^71220613 is an apocalyptic number.

It is an amenable number.

71220613 is a deficient number, since it is larger than the sum of its proper divisors (56795).

71220613 is a wasteful number, since it uses less digits than its factorization.

71220613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56794.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 71220613 is about 8439.2305928917. The cubic root of 71220613 is about 414.5102132930.

The spelling of 71220613 in words is "seventy-one million, two hundred twenty thousand, six hundred thirteen".