61091658 has 32 divisors (see below), whose sum is σ = 137445120. Its totient is φ = 20362428.

The previous prime is 61091651. The next prime is 61091687. The reversal of 61091658 is 85619016.

61091658 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61091651) 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 15 ways as a sum of consecutive naturals, for example, 2610 + ... + 11357.

It is an arithmetic number, because the mean of its divisors is an integer number (4295160).

Almost surely, 2^61091658 is an apocalyptic number.

61091658 is an abundant number, since it is smaller than the sum of its proper divisors (76353462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61091658 is an equidigital number, since it uses as much as digits as its factorization.

61091658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13990 (or 13972 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 61091658 is about 7816.1152755061. The cubic root of 61091658 is about 393.8467843716.

The spelling of 61091658 in words is "sixty-one million, ninety-one thousand, six hundred fifty-eight".