747543221 has 4 divisors (see below), whose sum is σ = 749931852. Its totient is φ = 745154592.

The previous prime is 747543211. The next prime is 747543253. The reversal of 747543221 is 122345747.

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 72063121 + 675480100 = 8489^2 + 25990^2 .

It is a cyclic number.

It is not a de Polignac number, because 747543221 - 2²⁶ = 680434357 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 (747543211) 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, 1193846 + ... + 1194471.

It is an arithmetic number, because the mean of its divisors is an integer number (187482963).

Almost surely, 2^747543221 is an apocalyptic number.

It is an amenable number.

747543221 is a deficient number, since it is larger than the sum of its proper divisors (2388631).

747543221 is a wasteful number, since it uses less digits than its factorization.

747543221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2388630.

The product of its digits is 47040, while the sum is 35.

The square root of 747543221 is about 27341.2366399181. The cubic root of 747543221 is about 907.5671526070.

Adding to 747543221 its reverse (122345747), we get a palindrome (869888968).

The spelling of 747543221 in words is "seven hundred forty-seven million, five hundred forty-three thousand, two hundred twenty-one".