61978979 has 4 divisors (see below), whose sum is σ = 62035584. Its totient is φ = 61922376.

The previous prime is 61978963. The next prime is 61979009. The reversal of 61978979 is 97987916.

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 61978979 - 2⁴ = 61978963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61978919) 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, 26627 + ... + 28860.

It is an arithmetic number, because the mean of its divisors is an integer number (15508896).

Almost surely, 2^61978979 is an apocalyptic number.

61978979 is a deficient number, since it is larger than the sum of its proper divisors (56605).

61978979 is a wasteful number, since it uses less digits than its factorization.

61978979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56604.

The product of its digits is 1714608, while the sum is 56.

The square root of 61978979 is about 7872.6729260144. The cubic root of 61978979 is about 395.7444253529.

The spelling of 61978979 in words is "sixty-one million, nine hundred seventy-eight thousand, nine hundred seventy-nine".