7221090529 has 3 divisors (see below), whose sum is σ = 7221175507. Its totient is φ = 7221005552.

The previous prime is 7221090517. The next prime is 7221090551. The reversal of 7221090529 is 9250901227.

The square root of 7221090529 is 84977.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 972504225 + 6248586304 = 31185^2 + 79048^2 .

It is not a de Polignac number, because 7221090529 - 2¹⁵ = 7221057761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7221090559) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 42489 + ... + 127465.

Almost surely, 2^7221090529 is an apocalyptic number.

7221090529 is the 84977-th square number.

7221090529 is the 42489-th centered octagonal number.

It is an amenable number.

7221090529 is a deficient number, since it is larger than the sum of its proper divisors (84978).

7221090529 is an frugal number, since it uses more digits than its factorization.

7221090529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169954 (or 84977 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The cubic root of 7221090529 is about 1932.8623647449.

The spelling of 7221090529 in words is "seven billion, two hundred twenty-one million, ninety thousand, five hundred twenty-nine".