61161979 has 4 divisors (see below), whose sum is σ = 61208280. Its totient is φ = 61115680.

The previous prime is 61161959. The next prime is 61161983. The reversal of 61161979 is 97916116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61161979 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61161959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21109 + ... + 23830.

It is an arithmetic number, because the mean of its divisors is an integer number (15302070).

Almost surely, 2^61161979 is an apocalyptic number.

61161979 is a deficient number, since it is larger than the sum of its proper divisors (46301).

61161979 is a wasteful number, since it uses less digits than its factorization.

61161979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46300.

The product of its digits is 20412, while the sum is 40.

The square root of 61161979 is about 7820.6124440481. The cubic root of 61161979 is about 393.9978419836.

The spelling of 61161979 in words is "sixty-one million, one hundred sixty-one thousand, nine hundred seventy-nine".