61091982 has 80 divisors (see below), whose sum is σ = 165702240. Its totient is φ = 16422912.

The previous prime is 61091977. The next prime is 61092037. The reversal of 61091982 is 28919016.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 17694 + ... + 20862.

It is an arithmetic number, because the mean of its divisors is an integer number (2071278).

Almost surely, 2^61091982 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61091982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82851120).

61091982 is an abundant number, since it is smaller than the sum of its proper divisors (104610258).

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

61091982 is a wasteful number, since it uses less digits than its factorization.

61091982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3207 (or 3198 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 61091982 is about 7816.1360018874. The cubic root of 61091982 is about 393.8474806266.

The spelling of 61091982 in words is "sixty-one million, ninety-one thousand, nine hundred eighty-two".