81101523 has 8 divisors (see below), whose sum is σ = 108378000. Its totient is φ = 53946368.

The previous prime is 81101507. The next prime is 81101539. The reversal of 81101523 is 32510118.

It is an interprime number because it is at equal distance from previous prime (81101507) and next prime (81101539).

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

It is a cyclic number.

It is not a de Polignac number, because 81101523 - 2⁴ = 81101507 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81101523.

It is not an unprimeable number, because it can be changed into a prime (81101563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28758 + ... + 31451.

It is an arithmetic number, because the mean of its divisors is an integer number (13547250).

Almost surely, 2^81101523 is an apocalyptic number.

81101523 is a deficient number, since it is larger than the sum of its proper divisors (27276477).

81101523 is a wasteful number, since it uses less digits than its factorization.

81101523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60661.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 81101523 is about 9005.6384004689. The cubic root of 81101523 is about 432.8555629098.

The spelling of 81101523 in words is "eighty-one million, one hundred one thousand, five hundred twenty-three".