7931505481 has 27 divisors (see below), whose sum is σ = 8545390581. Its totient is φ = 7361260704.

The previous prime is 7931505479. The next prime is 7931505551. The reversal of 7931505481 is 1845051397.

The square root of 7931505481 is 89059.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1687977225 + 6243528256 = 41085^2 + 79016^2 .

It is not a de Polignac number, because 7931505481 - 2¹ = 7931505479 is a prime.

It is a super-2 number, since 2×7931505481² (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 (7931505401) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 95560266 + ... + 95560348.

Almost surely, 2^7931505481 is an apocalyptic number.

7931505481 is the 89059-th square number.

7931505481 is the 44530-th centered octagonal number.

It is an amenable number.

7931505481 is a deficient number, since it is larger than the sum of its proper divisors (613885100).

7931505481 is an frugal number, since it uses more digits than its factorization.

7931505481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 43.

The cubic root of 7931505481 is about 1994.2757555600.

The spelling of 7931505481 in words is "seven billion, nine hundred thirty-one million, five hundred five thousand, four hundred eighty-one".