81677121 has 8 divisors (see below), whose sum is σ = 108958464. Its totient is φ = 54423600.

The previous prime is 81677111. The next prime is 81677131. The reversal of 81677121 is 12177618.

It is an interprime number because it is at equal distance from previous prime (81677111) and next prime (81677131).

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

It is not a de Polignac number, because 81677121 - 2¹¹ = 81675073 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (81677111) 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, 1296 + ... + 12846.

It is an arithmetic number, because the mean of its divisors is an integer number (13619808).

Almost surely, 2^81677121 is an apocalyptic number.

It is an amenable number.

81677121 is a deficient number, since it is larger than the sum of its proper divisors (27281343).

81677121 is a wasteful number, since it uses less digits than its factorization.

81677121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13911.

The product of its digits is 4704, while the sum is 33.

The square root of 81677121 is about 9037.5395434820. The cubic root of 81677121 is about 433.8771782528.

The spelling of 81677121 in words is "eighty-one million, six hundred seventy-seven thousand, one hundred twenty-one".