61107681 has 4 divisors (see below), whose sum is σ = 81476912. Its totient is φ = 40738452.

The previous prime is 61107679. The next prime is 61107703. The reversal of 61107681 is 18670116.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 61107681 - 2¹ = 61107679 is a prime.

It is a super-2 number, since 2×61107681² = 7468297354395522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61107181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10184611 + ... + 10184616.

It is an arithmetic number, because the mean of its divisors is an integer number (20369228).

Almost surely, 2^61107681 is an apocalyptic number.

It is an amenable number.

61107681 is a deficient number, since it is larger than the sum of its proper divisors (20369231).

61107681 is a wasteful number, since it uses less digits than its factorization.

61107681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20369230.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 61107681 is about 7817.1402059833. The cubic root of 61107681 is about 393.8812138152.

Adding to 61107681 its reverse (18670116), we get a palindrome (79777797).

The spelling of 61107681 in words is "sixty-one million, one hundred seven thousand, six hundred eighty-one".