81155675 has 12 divisors (see below), whose sum is σ = 103880256. Its totient is φ = 62829600.

The previous prime is 81155653. The next prime is 81155677. The reversal of 81155675 is 57655118.

It is a happy number.

It is not a de Polignac number, because 81155675 - 2⁶ = 81155611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81155677) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51584 + ... + 53133.

It is an arithmetic number, because the mean of its divisors is an integer number (8656688).

Almost surely, 2^81155675 is an apocalyptic number.

81155675 is a deficient number, since it is larger than the sum of its proper divisors (22724581).

81155675 is a wasteful number, since it uses less digits than its factorization.

81155675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104758 (or 104753 counting only the distinct ones).

The product of its digits is 42000, while the sum is 38.

The square root of 81155675 is about 9008.6444596288. The cubic root of 81155675 is about 432.9518816080.

The spelling of 81155675 in words is "eighty-one million, one hundred fifty-five thousand, six hundred seventy-five".