81694101 has 8 divisors (see below), whose sum is σ = 109012864. Its totient is φ = 54419040.

The previous prime is 81694097. The next prime is 81694103. The reversal of 81694101 is 10149618.

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

It is not a de Polignac number, because 81694101 - 2² = 81694097 is a prime.

It is a super-2 number, since 2×81694101² = 13347852276396402, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81694103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6280 + ... + 14241.

It is an arithmetic number, because the mean of its divisors is an integer number (13626608).

Almost surely, 2^81694101 is an apocalyptic number.

It is an amenable number.

81694101 is a deficient number, since it is larger than the sum of its proper divisors (27318763).

81694101 is a wasteful number, since it uses less digits than its factorization.

81694101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21851.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 81694101 is about 9038.4789096396. The cubic root of 81694101 is about 433.9072426655.

The spelling of 81694101 in words is "eighty-one million, six hundred ninety-four thousand, one hundred one".