61465681 has 4 divisors (see below), whose sum is σ = 61619364. Its totient is φ = 61312000.

The previous prime is 61465673. The next prime is 61465697. The reversal of 61465681 is 18656416.

61465681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60840000 + 625681 = 7800^2 + 791^2 .

It is a cyclic number.

It is not a de Polignac number, because 61465681 - 2³ = 61465673 is a prime.

It is a super-2 number, since 2×61465681² = 7556059881587522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61465681.

It is not an unprimeable number, because it can be changed into a prime (61465631) 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 3 ways as a sum of consecutive naturals, for example, 76240 + ... + 77041.

It is an arithmetic number, because the mean of its divisors is an integer number (15404841).

Almost surely, 2^61465681 is an apocalyptic number.

It is an amenable number.

61465681 is a deficient number, since it is larger than the sum of its proper divisors (153683).

61465681 is a wasteful number, since it uses less digits than its factorization.

61465681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153682.

The product of its digits is 34560, while the sum is 37.

The square root of 61465681 is about 7840.0051658146. The cubic root of 61465681 is about 394.6489023529.

It can be divided in two parts, 614656 and 81, that multiplied together give a 4-th power (49787136 = 84⁴).

The spelling of 61465681 in words is "sixty-one million, four hundred sixty-five thousand, six hundred eighty-one".