81113958 has 12 divisors (see below), whose sum is σ = 175746948. Its totient is φ = 27037980.

The previous prime is 81113951. The next prime is 81113993. The reversal of 81113958 is 85931118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81113951) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2253148 + ... + 2253183.

It is an arithmetic number, because the mean of its divisors is an integer number (14645579).

Almost surely, 2^81113958 is an apocalyptic number.

81113958 is an abundant number, since it is smaller than the sum of its proper divisors (94632990).

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

81113958 is a wasteful number, since it uses less digits than its factorization.

81113958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4506339 (or 4506336 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 81113958 is about 9006.3287748116. The cubic root of 81113958 is about 432.8776844995.

The spelling of 81113958 in words is "eighty-one million, one hundred thirteen thousand, nine hundred fifty-eight".