615486481 has 3 divisors (see below), whose sum is σ = 615511291. Its totient is φ = 615461672.

The previous prime is 615486461. The next prime is 615486511. The reversal of 615486481 is 184684516.

The square root of 615486481 is 24809.

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., 540144081 + 75342400 = 23241^2 + 8680^2 .

It is not a de Polignac number, because 615486481 - 2⁵ = 615486449 is a prime.

It is a super-2 number, since 2×615486481² = 757647216587526722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (615486451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12405 + ... + 37213.

Almost surely, 2^615486481 is an apocalyptic number.

615486481 is the 24809-th square number.

615486481 is the 12405-th centered octagonal number.

It is an amenable number.

615486481 is a deficient number, since it is larger than the sum of its proper divisors (24810).

615486481 is an frugal number, since it uses more digits than its factorization.

615486481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49618 (or 24809 counting only the distinct ones).

The product of its digits is 184320, while the sum is 43.

The cubic root of 615486481 is about 850.6276706473.

The spelling of 615486481 in words is "six hundred fifteen million, four hundred eighty-six thousand, four hundred eighty-one".