81501134 has 16 divisors (see below), whose sum is σ = 143624880. Its totient is φ = 34196160.

The previous prime is 81501083. The next prime is 81501143. The reversal of 81501134 is 43110518.

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, 142199 + ... + 142770.

It is an arithmetic number, because the mean of its divisors is an integer number (8976555).

Almost surely, 2^81501134 is an apocalyptic number.

81501134 is a deficient number, since it is larger than the sum of its proper divisors (62123746).

81501134 is a wasteful number, since it uses less digits than its factorization.

81501134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284995.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 81501134 is about 9027.7978488666. The cubic root of 81501134 is about 433.5653338877.

The spelling of 81501134 in words is "eighty-one million, five hundred one thousand, one hundred thirty-four".