61415681 has 8 divisors (see below), whose sum is σ = 66153984. Its totient is φ = 56849760.

The previous prime is 61415677. The next prime is 61415687. The reversal of 61415681 is 18651416.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61415681 - 2² = 61415677 is a prime.

It is a super-2 number, since 2×61415681² = 7543771745387522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61415687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42356 + ... + 43781.

It is an arithmetic number, because the mean of its divisors is an integer number (8269248).

Almost surely, 2^61415681 is an apocalyptic number.

It is an amenable number.

61415681 is a deficient number, since it is larger than the sum of its proper divisors (4738303).

61415681 is a wasteful number, since it uses less digits than its factorization.

61415681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86191.

The product of its digits is 5760, while the sum is 32.

The square root of 61415681 is about 7836.8157436551. The cubic root of 61415681 is about 394.5418626860.

The spelling of 61415681 in words is "sixty-one million, four hundred fifteen thousand, six hundred eighty-one".