61285458481 has 27 divisors (see below), whose sum is σ = 67334690241. Its totient is φ = 55754247744.

The previous prime is 61285458383. The next prime is 61285458499. The reversal of 61285458481 is 18485458216.

The square root of 61285458481 is 247559.

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 5447768481 + 55837690000 = 73809^2 + 236300^2 .

It is not a de Polignac number, because 61285458481 - 2³³ = 52695523889 is a prime.

It is a super-2 number, since 2×61285458481² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61085458481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 440902510 + ... + 440902648.

Almost surely, 2^61285458481 is an apocalyptic number.

61285458481 is the 247559-th square number.

61285458481 is the 123780-th centered octagonal number.

It is an amenable number.

61285458481 is a deficient number, since it is larger than the sum of its proper divisors (6049231760).

61285458481 is an equidigital number, since it uses as much as digits as its factorization.

61285458481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578 (or 289 counting only the distinct ones).

The product of its digits is 2457600, while the sum is 52.

The spelling of 61285458481 in words is "sixty-one billion, two hundred eighty-five million, four hundred fifty-eight thousand, four hundred eighty-one".