61353809 has 4 divisors (see below), whose sum is σ = 66931440. Its totient is φ = 55776180.

The previous prime is 61353781. The next prime is 61353839. The reversal of 61353809 is 90835316.

61353809 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, 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 61353809 - 2¹⁶ = 61288273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61353839) 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, 2788799 + ... + 2788820.

It is an arithmetic number, because the mean of its divisors is an integer number (16732860).

Almost surely, 2^61353809 is an apocalyptic number.

It is an amenable number.

61353809 is a deficient number, since it is larger than the sum of its proper divisors (5577631).

61353809 is a wasteful number, since it uses less digits than its factorization.

61353809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5577630.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 61353809 is about 7832.8672272674. The cubic root of 61353809 is about 394.4093270653.

The spelling of 61353809 in words is "sixty-one million, three hundred fifty-three thousand, eight hundred nine".