61911939 has 4 divisors (see below), whose sum is σ = 82549256. Its totient is φ = 41274624.

The previous prime is 61911919. The next prime is 61911947. The reversal of 61911939 is 93911916.

It is a happy number.

61911939 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 61911939 - 2⁵ = 61911907 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61911897 and 61911906.

It is not an unprimeable number, because it can be changed into a prime (61911919) 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, 10318654 + ... + 10318659.

It is an arithmetic number, because the mean of its divisors is an integer number (20637314).

Almost surely, 2^61911939 is an apocalyptic number.

61911939 is a deficient number, since it is larger than the sum of its proper divisors (20637317).

61911939 is a wasteful number, since it uses less digits than its factorization.

61911939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20637316.

The product of its digits is 13122, while the sum is 39.

The square root of 61911939 is about 7868.4140079180. The cubic root of 61911939 is about 395.6016872926.

The spelling of 61911939 in words is "sixty-one million, nine hundred eleven thousand, nine hundred thirty-nine".