71653613 has 2 divisors, whose sum is σ = 71653614. Its totient is φ = 71653612.

The previous prime is 71653567. The next prime is 71653643. The reversal of 71653613 is 31635617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49252324 + 22401289 = 7018^2 + 4733^2 .

It is a cyclic number.

It is not a de Polignac number, because 71653613 - 2⁸ = 71653357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71653613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71653643) 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 as a sum of consecutive naturals, namely, 35826806 + 35826807.

It is an arithmetic number, because the mean of its divisors is an integer number (35826807).

Almost surely, 2^71653613 is an apocalyptic number.

It is an amenable number.

71653613 is a deficient number, since it is larger than the sum of its proper divisors (1).

71653613 is an equidigital number, since it uses as much as digits as its factorization.

71653613 is an odious number, because the sum of its binary digits is odd.

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

The square root of 71653613 is about 8464.8457162550. The cubic root of 71653613 is about 415.3485492947.

The spelling of 71653613 in words is "seventy-one million, six hundred fifty-three thousand, six hundred thirteen".