81000948 has 24 divisors (see below), whose sum is σ = 216002752. Its totient is φ = 23143104.

The previous prime is 81000929. The next prime is 81000961. The reversal of 81000948 is 84900018.

It is a happy number.

It is a super-2 number, since 2×81000948² = 13122307153797408, which contains 22 as substring.

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 482065 + ... + 482232.

Almost surely, 2^81000948 is an apocalyptic number.

It is an amenable number.

81000948 is an abundant number, since it is smaller than the sum of its proper divisors (135001804).

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

81000948 is a wasteful number, since it uses less digits than its factorization.

81000948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964311 (or 964309 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 81000948 is about 9000.0526665126. The cubic root of 81000948 is about 432.6765590518.

The spelling of 81000948 in words is "eighty-one million, nine hundred forty-eight", and thus it is an aban number.