61117979 has 4 divisors (see below), whose sum is σ = 65819376. Its totient is φ = 56416584.

The previous prime is 61117967. The next prime is 61117999. The reversal of 61117979 is 97971116.

61117979 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 a cyclic number.

It is not a de Polignac number, because 61117979 - 2¹² = 61113883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61117949) 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, 2350679 + ... + 2350704.

It is an arithmetic number, because the mean of its divisors is an integer number (16454844).

Almost surely, 2^61117979 is an apocalyptic number.

61117979 is a deficient number, since it is larger than the sum of its proper divisors (4701397).

61117979 is a wasteful number, since it uses less digits than its factorization.

61117979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4701396.

The product of its digits is 23814, while the sum is 41.

The square root of 61117979 is about 7817.7988590140. The cubic root of 61117979 is about 393.9033384802.

The spelling of 61117979 in words is "sixty-one million, one hundred seventeen thousand, nine hundred seventy-nine".