61979619 has 16 divisors (see below), whose sum is σ = 89137664. Its totient is φ = 38080800.

The previous prime is 61979591. The next prime is 61979627. The reversal of 61979619 is 91697916.

It is not a de Polignac number, because 61979619 - 2⁵ = 61979587 is a prime.

It is a super-2 number, since 2×61979619² = 7682946342770322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61979629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47364 + ... + 48654.

It is an arithmetic number, because the mean of its divisors is an integer number (5571104).

Almost surely, 2^61979619 is an apocalyptic number.

61979619 is a deficient number, since it is larger than the sum of its proper divisors (27158045).

61979619 is a wasteful number, since it uses less digits than its factorization.

61979619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2538.

The product of its digits is 183708, while the sum is 48.

The square root of 61979619 is about 7872.7135728413. The cubic root of 61979619 is about 395.7457875113.

The spelling of 61979619 in words is "sixty-one million, nine hundred seventy-nine thousand, six hundred nineteen".