81477115 has 16 divisors (see below), whose sum is σ = 99622656. Its totient is φ = 63957600.

The previous prime is 81477103. The next prime is 81477133. The reversal of 81477115 is 51177418.

It is not a de Polignac number, because 81477115 - 2⁷ = 81476987 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100060 + ... + 100870.

It is an arithmetic number, because the mean of its divisors is an integer number (6226416).

Almost surely, 2^81477115 is an apocalyptic number.

81477115 is a deficient number, since it is larger than the sum of its proper divisors (18145541).

81477115 is a wasteful number, since it uses less digits than its factorization.

81477115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170.

The product of its digits is 7840, while the sum is 34.

The square root of 81477115 is about 9026.4674707219. The cubic root of 81477115 is about 433.5227380430.

The spelling of 81477115 in words is "eighty-one million, four hundred seventy-seven thousand, one hundred fifteen".