71221753 has 4 divisors (see below), whose sum is σ = 71852148. Its totient is φ = 70591360.

The previous prime is 71221741. The next prime is 71221757. The reversal of 71221753 is 35712217.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29127609 + 42094144 = 5397^2 + 6488^2 .

It is a cyclic number.

It is not a de Polignac number, because 71221753 - 2²⁵ = 37667321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71221757) 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, 315028 + ... + 315253.

It is an arithmetic number, because the mean of its divisors is an integer number (17963037).

Almost surely, 2^71221753 is an apocalyptic number.

It is an amenable number.

71221753 is a deficient number, since it is larger than the sum of its proper divisors (630395).

71221753 is a wasteful number, since it uses less digits than its factorization.

71221753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630394.

The product of its digits is 2940, while the sum is 28.

The square root of 71221753 is about 8439.2981343237. The cubic root of 71221753 is about 414.5124249146.

The spelling of 71221753 in words is "seventy-one million, two hundred twenty-one thousand, seven hundred fifty-three".