7291622881 has 9 divisors (see below), whose sum is σ = 7747314771. Its totient is φ = 6861337632.

The previous prime is 7291622873. The next prime is 7291622953. The reversal of 7291622881 is 1882261927.

The square root of 7291622881 is 85391.

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

It can be written as a sum of positive squares in only one way, i.e., 5676869025 + 1614753856 = 75345^2 + 40184^2 .

It is not a de Polignac number, because 7291622881 - 2³ = 7291622873 is a prime.

It is a super-2 number, since 2×7291622881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7291622851) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1449136 + ... + 1454158.

Almost surely, 2^7291622881 is an apocalyptic number.

7291622881 is the 85391-st square number.

7291622881 is the 42696-th centered octagonal number.

It is an amenable number.

7291622881 is a deficient number, since it is larger than the sum of its proper divisors (455691890).

7291622881 is an frugal number, since it uses more digits than its factorization.

7291622881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10080 (or 5040 counting only the distinct ones).

The product of its digits is 193536, while the sum is 46.

The cubic root of 7291622881 is about 1939.1350947614.

The spelling of 7291622881 in words is "seven billion, two hundred ninety-one million, six hundred twenty-two thousand, eight hundred eighty-one".