81145938 has 8 divisors (see below), whose sum is σ = 162291888. Its totient is φ = 27048644.

The previous prime is 81145937. The next prime is 81145943. The reversal of 81145938 is 83954118.

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

81145938 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 81145896 and 81145905.

It is not an unprimeable number, because it can be changed into a prime (81145937) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6762156 + ... + 6762167.

It is an arithmetic number, because the mean of its divisors is an integer number (20286486).

Almost surely, 2^81145938 is an apocalyptic number.

81145938 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.

81145938 is a wasteful number, since it uses less digits than its factorization.

81145938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13524328.

The product of its digits is 34560, while the sum is 39.

The square root of 81145938 is about 9008.1040180495. The cubic root of 81145938 is about 432.9345658295.

The spelling of 81145938 in words is "eighty-one million, one hundred forty-five thousand, nine hundred thirty-eight".