61606081 has 4 divisors (see below), whose sum is σ = 61622064. Its totient is φ = 61590100.

The previous prime is 61606043. The next prime is 61606093. The reversal of 61606081 is 18060616.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 61606081 - 2⁷ = 61605953 is a prime.

It is a super-2 number, since 2×61606081² = 7590618432357122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61606001) 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, 1746 + ... + 11236.

It is an arithmetic number, because the mean of its divisors is an integer number (15405516).

Almost surely, 2^61606081 is an apocalyptic number.

It is an amenable number.

61606081 is a deficient number, since it is larger than the sum of its proper divisors (15983).

61606081 is an equidigital number, since it uses as much as digits as its factorization.

61606081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15982.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 61606081 is about 7848.9541341506. The cubic root of 61606081 is about 394.9491597227.

Adding to 61606081 its reverse (18060616), we get a palindrome (79666697).

The spelling of 61606081 in words is "sixty-one million, six hundred six thousand, eighty-one".