81667101 has 8 divisors (see below), whose sum is σ = 108996160. Its totient is φ = 54391392.

The previous prime is 81667097. The next prime is 81667123. The reversal of 81667101 is 10176618.

It is a happy number.

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

It is not a de Polignac number, because 81667101 - 2² = 81667097 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81667141) 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, 9616 + ... + 15993.

It is an arithmetic number, because the mean of its divisors is an integer number (13624520).

Almost surely, 2^81667101 is an apocalyptic number.

It is an amenable number.

81667101 is a deficient number, since it is larger than the sum of its proper divisors (27329059).

81667101 is a wasteful number, since it uses less digits than its factorization.

81667101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26675.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 81667101 is about 9036.9851720582. The cubic root of 81667101 is about 433.8594351073.

The spelling of 81667101 in words is "eighty-one million, six hundred sixty-seven thousand, one hundred one".