7821810481 has 9 divisors (see below), whose sum is σ = 7961942041. Its totient is φ = 7684107844.

The previous prime is 7821810473. The next prime is 7821810499. The reversal of 7821810481 is 1840181287.

The square root of 7821810481 is 88441.

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

It is not a de Polignac number, because 7821810481 - 2³ = 7821810473 is a prime.

It is a super-2 number, since 2×7821810481² (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 (7821810281) 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, 5217270 + ... + 5218768.

Almost surely, 2^7821810481 is an apocalyptic number.

7821810481 is the 88441-st square number.

7821810481 is the 44221-st centered octagonal number.

It is an amenable number.

7821810481 is a deficient number, since it is larger than the sum of its proper divisors (140131560).

7821810481 is an frugal number, since it uses more digits than its factorization.

7821810481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3116 (or 1558 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 40.

The cubic root of 7821810481 is about 1985.0392402998.

The spelling of 7821810481 in words is "seven billion, eight hundred twenty-one million, eight hundred ten thousand, four hundred eighty-one".