81001134 has 24 divisors (see below), whose sum is σ = 182003640. Its totient is φ = 27000216.

The previous prime is 81001097. The next prime is 81001139. The reversal of 81001134 is 43110018.

It is a super-2 number, since 2×81001134² = 13122367418571912, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81001139) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 82849 + ... + 83820.

It is an arithmetic number, because the mean of its divisors is an integer number (7583485).

Almost surely, 2^81001134 is an apocalyptic number.

81001134 is an abundant number, since it is smaller than the sum of its proper divisors (101002506).

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

81001134 is a wasteful number, since it uses less digits than its factorization.

81001134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166686 (or 166674 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 81001134 is about 9000.0629997795. The cubic root of 81001134 is about 432.6768902322.

The spelling of 81001134 in words is "eighty-one million, one thousand, one hundred thirty-four".