81469955 has 8 divisors (see below), whose sum is σ = 111730272. Its totient is φ = 55865088.

The previous prime is 81469939. The next prime is 81469981. The reversal of 81469955 is 55996418.

It is a happy number.

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 81469955 - 2⁴ = 81469939 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1163822 + ... + 1163891.

It is an arithmetic number, because the mean of its divisors is an integer number (13966284).

Almost surely, 2^81469955 is an apocalyptic number.

81469955 is a deficient number, since it is larger than the sum of its proper divisors (30260317).

81469955 is a wasteful number, since it uses less digits than its factorization.

81469955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2327725.

The product of its digits is 388800, while the sum is 47.

The square root of 81469955 is about 9026.0708505972. The cubic root of 81469955 is about 433.5100387154.

The spelling of 81469955 in words is "eighty-one million, four hundred sixty-nine thousand, nine hundred fifty-five".