61408621 has 4 divisors (see below), whose sum is σ = 61427772. Its totient is φ = 61389472.

The previous prime is 61408619. The next prime is 61408661. The reversal of 61408621 is 12680416.

61408621 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 3861225 + 57547396 = 1965^2 + 7586^2 .

It is a cyclic number.

It is not a de Polignac number, because 61408621 - 2¹ = 61408619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61408621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61408661) 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, 3466 + ... + 11611.

It is an arithmetic number, because the mean of its divisors is an integer number (15356943).

Almost surely, 2^61408621 is an apocalyptic number.

It is an amenable number.

61408621 is a deficient number, since it is larger than the sum of its proper divisors (19151).

61408621 is a wasteful number, since it uses less digits than its factorization.

61408621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19150.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 61408621 is about 7836.3652926596. The cubic root of 61408621 is about 394.5267440049.

The spelling of 61408621 in words is "sixty-one million, four hundred eight thousand, six hundred twenty-one".