61532681 has 12 divisors (see below), whose sum is σ = 72218772. Its totient is φ = 52270848.

The previous prime is 61532641. The next prime is 61532687. The reversal of 61532681 is 18623516.

It is a happy number.

61532681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 614656 + 60918025 = 784^2 + 7805^2 .

It is a de Polignac number, because none of the positive numbers 2^k-61532681 is a prime.

It is a super-2 number, since 2×61532681² = 7572541662095522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61532687) 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 11 ways as a sum of consecutive naturals, for example, 20 + ... + 11093.

It is an arithmetic number, because the mean of its divisors is an integer number (6018231).

Almost surely, 2^61532681 is an apocalyptic number.

It is an amenable number.

61532681 is a deficient number, since it is larger than the sum of its proper divisors (10686091).

61532681 is a wasteful number, since it uses less digits than its factorization.

61532681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11240 (or 11233 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 61532681 is about 7844.2769583946. The cubic root of 61532681 is about 394.7922445369.

The spelling of 61532681 in words is "sixty-one million, five hundred thirty-two thousand, six hundred eighty-one".