81508795 has 16 divisors (see below), whose sum is σ = 105325920. Its totient is φ = 60327424.

The previous prime is 81508793. The next prime is 81508831. The reversal of 81508795 is 59780518.

It is not a de Polignac number, because 81508795 - 2¹ = 81508793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81508793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3112 + ... + 13141.

It is an arithmetic number, because the mean of its divisors is an integer number (6582870).

Almost surely, 2^81508795 is an apocalyptic number.

81508795 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

81508795 is a deficient number, since it is larger than the sum of its proper divisors (23817125).

81508795 is a wasteful number, since it uses less digits than its factorization.

81508795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16334.

The product of its (nonzero) digits is 100800, while the sum is 43.

The square root of 81508795 is about 9028.2221394913. Note that the first 3 decimals coincide. The cubic root of 81508795 is about 433.5789183201.

The spelling of 81508795 in words is "eighty-one million, five hundred eight thousand, seven hundred ninety-five".