61017993 has 6 divisors (see below), whose sum is σ = 88137114. Its totient is φ = 40678656.

The previous prime is 61017973. The next prime is 61017997. The reversal of 61017993 is 39971016.

61017993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 39087504 + 21930489 = 6252^2 + 4683^2 .

It is not a de Polignac number, because 61017993 - 2⁵ = 61017961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61017997) 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 5 ways as a sum of consecutive naturals, for example, 3389880 + ... + 3389897.

It is an arithmetic number, because the mean of its divisors is an integer number (14689519).

Almost surely, 2^61017993 is an apocalyptic number.

It is an amenable number.

61017993 is a deficient number, since it is larger than the sum of its proper divisors (27119121).

61017993 is a wasteful number, since it uses less digits than its factorization.

61017993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6779783 (or 6779780 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 61017993 is about 7811.4014747675. The cubic root of 61017993 is about 393.6884190921.

The spelling of 61017993 in words is "sixty-one million, seventeen thousand, nine hundred ninety-three".