81838177 has 4 divisors (see below), whose sum is σ = 81923776. Its totient is φ = 81752580.

The previous prime is 81838157. The next prime is 81838193. The reversal of 81838177 is 77183818.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81838177 - 2⁷ = 81838049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81838147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41349 + ... + 43282.

It is an arithmetic number, because the mean of its divisors is an integer number (20480944).

Almost surely, 2^81838177 is an apocalyptic number.

It is an amenable number.

81838177 is a deficient number, since it is larger than the sum of its proper divisors (85599).

81838177 is an equidigital number, since it uses as much as digits as its factorization.

81838177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85598.

The product of its digits is 75264, while the sum is 43.

The square root of 81838177 is about 9046.4455450746. The cubic root of 81838177 is about 434.1621729651.

The spelling of 81838177 in words is "eighty-one million, eight hundred thirty-eight thousand, one hundred seventy-seven".