61909555 has 4 divisors (see below), whose sum is σ = 74291472. Its totient is φ = 49527640.

The previous prime is 61909553. The next prime is 61909567. The reversal of 61909555 is 55590916.

61909555 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 is not a de Polignac number, because 61909555 - 2¹ = 61909553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61909553) 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, 6190951 + ... + 6190960.

It is an arithmetic number, because the mean of its divisors is an integer number (18572868).

Almost surely, 2^61909555 is an apocalyptic number.

61909555 is a deficient number, since it is larger than the sum of its proper divisors (12381917).

61909555 is a wasteful number, since it uses less digits than its factorization.

61909555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12381916.

The product of its (nonzero) digits is 60750, while the sum is 40.

The square root of 61909555 is about 7868.2625146852. The cubic root of 61909555 is about 395.5966095077.

The spelling of 61909555 in words is "sixty-one million, nine hundred nine thousand, five hundred fifty-five".