61935409 has 4 divisors (see below), whose sum is σ = 61973604. Its totient is φ = 61897216.

The previous prime is 61935407. The next prime is 61935439. The reversal of 61935409 is 90453916.

61935409 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 61074225 + 861184 = 7815^2 + 928^2 .

It is a cyclic number.

It is not a de Polignac number, because 61935409 - 2¹ = 61935407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61935407) 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, 16552 + ... + 19945.

It is an arithmetic number, because the mean of its divisors is an integer number (15493401).

Almost surely, 2^61935409 is an apocalyptic number.

It is an amenable number.

61935409 is a deficient number, since it is larger than the sum of its proper divisors (38195).

61935409 is a wasteful number, since it uses less digits than its factorization.

61935409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38194.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 61935409 is about 7869.9052726192. The cubic root of 61935409 is about 395.6516701055.

The spelling of 61935409 in words is "sixty-one million, nine hundred thirty-five thousand, four hundred nine".