61245621 has 6 divisors (see below), whose sum is σ = 88465910. Its totient is φ = 40830408.

The previous prime is 61245601. The next prime is 61245629. The reversal of 61245621 is 12654216.

61245621 is a `hidden beast` number, since 612 + 45 + 6 + 2 + 1 = 666.

61245621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 61074225 + 171396 = 7815^2 + 414^2 .

It is not a de Polignac number, because 61245621 - 2⁶ = 61245557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61245629) 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 5 ways as a sum of consecutive naturals, for example, 3402526 + ... + 3402543.

Almost surely, 2^61245621 is an apocalyptic number.

It is an amenable number.

61245621 is a deficient number, since it is larger than the sum of its proper divisors (27220289).

61245621 is a wasteful number, since it uses less digits than its factorization.

61245621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6805075 (or 6805072 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 61245621 is about 7825.9581522009. The cubic root of 61245621 is about 394.1773639514.

Adding to 61245621 its reverse (12654216), we get a palindrome (73899837).

The spelling of 61245621 in words is "sixty-one million, two hundred forty-five thousand, six hundred twenty-one".