61024721 has 4 divisors (see below), whose sum is σ = 61052772. Its totient is φ = 60996672.

The previous prime is 61024699. The next prime is 61024723. The reversal of 61024721 is 12742016.

61024721 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 38887696 + 22137025 = 6236^2 + 4705^2 .

It is a cyclic number.

It is not a de Polignac number, because 61024721 - 2¹⁸ = 60762577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61024723) 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, 10460 + ... + 15213.

It is an arithmetic number, because the mean of its divisors is an integer number (15263193).

Almost surely, 2^61024721 is an apocalyptic number.

It is an amenable number.

61024721 is a deficient number, since it is larger than the sum of its proper divisors (28051).

61024721 is a wasteful number, since it uses less digits than its factorization.

61024721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28050.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 61024721 is about 7811.8321154515. The cubic root of 61024721 is about 393.7028882577.

Adding to 61024721 its reverse (12742016), we get a palindrome (73766737).

The spelling of 61024721 in words is "sixty-one million, twenty-four thousand, seven hundred twenty-one".