81234965 has 16 divisors (see below), whose sum is σ = 116252928. Its totient is φ = 53281536.

The previous prime is 81234961. The next prime is 81234977. The reversal of 81234965 is 56943218.

It is a happy number.

It is not a de Polignac number, because 81234965 - 2² = 81234961 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81234961) 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 15 ways as a sum of consecutive naturals, for example, 49652 + ... + 51261.

It is an arithmetic number, because the mean of its divisors is an integer number (7265808).

Almost surely, 2^81234965 is an apocalyptic number.

It is an amenable number.

81234965 is a deficient number, since it is larger than the sum of its proper divisors (35017963).

81234965 is a wasteful number, since it uses less digits than its factorization.

81234965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100948.

The product of its digits is 51840, while the sum is 38.

The square root of 81234965 is about 9013.0441583296. The cubic root of 81234965 is about 433.0928353199.

The spelling of 81234965 in words is "eighty-one million, two hundred thirty-four thousand, nine hundred sixty-five".