81955153 has 8 divisors (see below), whose sum is σ = 94849280. Its totient is φ = 69357600.

The previous prime is 81955127. The next prime is 81955157. The reversal of 81955153 is 35155918.

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 81955153 - 2⁹ = 81954641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81955157) by changing a digit.

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, 73548 + ... + 74653.

It is an arithmetic number, because the mean of its divisors is an integer number (11856160).

Almost surely, 2^81955153 is an apocalyptic number.

It is an amenable number.

81955153 is a deficient number, since it is larger than the sum of its proper divisors (12894127).

81955153 is a wasteful number, since it uses less digits than its factorization.

81955153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148287.

The product of its digits is 27000, while the sum is 37.

The square root of 81955153 is about 9052.9085381440. The cubic root of 81955153 is about 434.3689321168.

The spelling of 81955153 in words is "eighty-one million, nine hundred fifty-five thousand, one hundred fifty-three".