81964127 has 8 divisors (see below), whose sum is σ = 94639776. Its totient is φ = 69530112.

The previous prime is 81964117. The next prime is 81964133. The reversal of 81964127 is 72146918.

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 81964127 - 2¹⁶ = 81898591 is a prime.

It is a super-2 number, since 2×81964127² = 13436236229744258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81964117) 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, 59678 + ... + 61035.

It is an arithmetic number, because the mean of its divisors is an integer number (11829972).

Almost surely, 2^81964127 is an apocalyptic number.

81964127 is a deficient number, since it is larger than the sum of its proper divisors (12675649).

81964127 is a wasteful number, since it uses less digits than its factorization.

81964127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120817.

The product of its digits is 24192, while the sum is 38.

The square root of 81964127 is about 9053.4041663896. The cubic root of 81964127 is about 434.3847858465.

It can be divided in two parts, 819 and 64127, that added together give a palindrome (64946).

The spelling of 81964127 in words is "eighty-one million, nine hundred sixty-four thousand, one hundred twenty-seven".