81153273 has 8 divisors (see below), whose sum is σ = 108553536. Its totient is φ = 53927600.

The previous prime is 81153263. The next prime is 81153277. The reversal of 81153273 is 37235118.

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 81153273 - 2⁶ = 81153209 is a prime.

It is a super-2 number, since 2×81153273² = 13171707437225058, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81153273.

It is not an unprimeable number, because it can be changed into a prime (81153277) 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, 42558 + ... + 44423.

It is an arithmetic number, because the mean of its divisors is an integer number (13569192).

Almost surely, 2^81153273 is an apocalyptic number.

It is an amenable number.

81153273 is a deficient number, since it is larger than the sum of its proper divisors (27400263).

81153273 is a wasteful number, since it uses less digits than its factorization.

81153273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87295.

The product of its digits is 5040, while the sum is 30.

The square root of 81153273 is about 9008.5111422476. The cubic root of 81153273 is about 432.9476101439.

The spelling of 81153273 in words is "eighty-one million, one hundred fifty-three thousand, two hundred seventy-three".