81106651 has 8 divisors (see below), whose sum is σ = 84495600. Its totient is φ = 77784960.

The previous prime is 81106621. The next prime is 81106657. The reversal of 81106651 is 15660118.

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 81106651 - 2²¹ = 79009499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81106657) 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, 14346 + ... + 19183.

It is an arithmetic number, because the mean of its divisors is an integer number (10561950).

Almost surely, 2^81106651 is an apocalyptic number.

81106651 is a deficient number, since it is larger than the sum of its proper divisors (3388949).

81106651 is a wasteful number, since it uses less digits than its factorization.

81106651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33629.

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

The square root of 81106651 is about 9005.9231064894. The cubic root of 81106651 is about 432.8646857822.

Adding to 81106651 its reverse (15660118), we get a palindrome (96766769).

The spelling of 81106651 in words is "eighty-one million, one hundred six thousand, six hundred fifty-one".