71605213 has 2 divisors, whose sum is σ = 71605214. Its totient is φ = 71605212.

The previous prime is 71605201. The next prime is 71605223. The reversal of 71605213 is 31250617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44116164 + 27489049 = 6642^2 + 5243^2 .

It is an emirp because it is prime and its reverse (31250617) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71605213 - 2¹⁷ = 71474141 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71605223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35802606 + 35802607.

It is an arithmetic number, because the mean of its divisors is an integer number (35802607).

Almost surely, 2^71605213 is an apocalyptic number.

It is an amenable number.

71605213 is a deficient number, since it is larger than the sum of its proper divisors (1).

71605213 is an equidigital number, since it uses as much as digits as its factorization.

71605213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 71605213 is about 8461.9863507335. The cubic root of 71605213 is about 415.2550094765.

It can be divided in two parts, 71 and 605213, that added together give a square (605284 = 778²).

The spelling of 71605213 in words is "seventy-one million, six hundred five thousand, two hundred thirteen".