81616105 has 8 divisors (see below), whose sum is σ = 98163072. Its totient is φ = 65143728.

The previous prime is 81616097. The next prime is 81616123. The reversal of 81616105 is 50161618.

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

It is a cyclic number.

It is not a de Polignac number, because 81616105 - 2³ = 81616097 is a prime.

It is a super-2 number, since 2×81616105² = 13322377190742050, 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 an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16209 + ... + 20638.

It is an arithmetic number, because the mean of its divisors is an integer number (12270384).

Almost surely, 2^81616105 is an apocalyptic number.

It is an amenable number.

81616105 is a deficient number, since it is larger than the sum of its proper divisors (16546967).

81616105 is a wasteful number, since it uses less digits than its factorization.

81616105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37295.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 81616105 is about 9034.1632152624. The cubic root of 81616105 is about 433.7691102710.

The spelling of 81616105 in words is "eighty-one million, six hundred sixteen thousand, one hundred five".