61104721 has 4 divisors (see below), whose sum is σ = 63761472. Its totient is φ = 58447972.

The previous prime is 61104713. The next prime is 61104731. The reversal of 61104721 is 12740116.

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 a cyclic number.

It is not a de Polignac number, because 61104721 - 2³ = 61104713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61104692 and 61104701.

It is not an unprimeable number, because it can be changed into a prime (61104731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1328341 + ... + 1328386.

It is an arithmetic number, because the mean of its divisors is an integer number (15940368).

Almost surely, 2^61104721 is an apocalyptic number.

It is an amenable number.

61104721 is a deficient number, since it is larger than the sum of its proper divisors (2656751).

61104721 is a wasteful number, since it uses less digits than its factorization.

61104721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2656750.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 61104721 is about 7816.9508761409. The cubic root of 61104721 is about 393.8748539644.

Adding to 61104721 its reverse (12740116), we get a palindrome (73844837).

The spelling of 61104721 in words is "sixty-one million, one hundred four thousand, seven hundred twenty-one".