61085979 has 24 divisors (see below), whose sum is σ = 89771760. Its totient is φ = 40022208.

The previous prime is 61085963. The next prime is 61085987. The reversal of 61085979 is 97958016.

It is not a de Polignac number, because 61085979 - 2⁴ = 61085963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61085989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 220389 + ... + 220665.

It is an arithmetic number, because the mean of its divisors is an integer number (3740490).

Almost surely, 2^61085979 is an apocalyptic number.

61085979 is a deficient number, since it is larger than the sum of its proper divisors (28685781).

61085979 is a wasteful number, since it uses less digits than its factorization.

61085979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619 (or 616 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 61085979 is about 7815.7519791764. The cubic root of 61085979 is about 393.8345801674.

The spelling of 61085979 in words is "sixty-one million, eighty-five thousand, nine hundred seventy-nine".