81100938 has 8 divisors (see below), whose sum is σ = 162201888. Its totient is φ = 27033644.

The previous prime is 81100937. The next prime is 81100939. The reversal of 81100938 is 83900118.

It is an interprime number because it is at equal distance from previous prime (81100937) and next prime (81100939).

It is a sphenic number, since it is the product of 3 distinct primes.

81100938 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (81100933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6758406 + ... + 6758417.

It is an arithmetic number, because the mean of its divisors is an integer number (20275236).

Almost surely, 2^81100938 is an apocalyptic number.

81100938 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81100938 is a wasteful number, since it uses less digits than its factorization.

81100938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13516828.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 81100938 is about 9005.6059207585. The cubic root of 81100938 is about 432.8545221521.

The spelling of 81100938 in words is "eighty-one million, one hundred thousand, nine hundred thirty-eight".