81361101 has 8 divisors (see below), whose sum is σ = 110009664. Its totient is φ = 53476640.

The previous prime is 81361079. The next prime is 81361123. The reversal of 81361101 is 10116318.

It is an interprime number because it is at equal distance from previous prime (81361079) and next prime (81361123).

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 81361101 - 2⁵ = 81361069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81361141) 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, 190776 + ... + 191201.

It is an arithmetic number, because the mean of its divisors is an integer number (13751208).

Almost surely, 2^81361101 is an apocalyptic number.

It is an amenable number.

81361101 is a deficient number, since it is larger than the sum of its proper divisors (28648563).

81361101 is a wasteful number, since it uses less digits than its factorization.

81361101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382051.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 81361101 is about 9020.0388580094. The cubic root of 81361101 is about 433.3168782049.

Adding to 81361101 its reverse (10116318), we get a palindrome (91477419).

The spelling of 81361101 in words is "eighty-one million, three hundred sixty-one thousand, one hundred one".