61089979 has 4 divisors (see below), whose sum is σ = 63196560. Its totient is φ = 58983400.

The previous prime is 61089967. The next prime is 61089991. The reversal of 61089979 is 97998016.

61089979 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 an interprime number because it is at equal distance from previous prime (61089967) and next prime (61089991).

It is a cyclic number.

It is not a de Polignac number, because 61089979 - 2¹⁵ = 61057211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61089929) 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, 1053247 + ... + 1053304.

It is an arithmetic number, because the mean of its divisors is an integer number (15799140).

Almost surely, 2^61089979 is an apocalyptic number.

61089979 is a deficient number, since it is larger than the sum of its proper divisors (2106581).

61089979 is a wasteful number, since it uses less digits than its factorization.

61089979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2106580.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 61089979 is about 7816.0078684710. The cubic root of 61089979 is about 393.8431762695.

The spelling of 61089979 in words is "sixty-one million, eighty-nine thousand, nine hundred seventy-nine".