81131153 has 8 divisors (see below), whose sum is σ = 83139936. Its totient is φ = 79128000.

The previous prime is 81131147. The next prime is 81131173. The reversal of 81131153 is 35113118.

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 81131153 - 2⁴ = 81131137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81131173) 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, 50858 + ... + 52428.

It is an arithmetic number, because the mean of its divisors is an integer number (10392492).

Almost surely, 2^81131153 is an apocalyptic number.

It is an amenable number.

81131153 is a deficient number, since it is larger than the sum of its proper divisors (2008783).

81131153 is a wasteful number, since it uses less digits than its factorization.

81131153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2815.

The product of its digits is 360, while the sum is 23.

The square root of 81131153 is about 9007.2833307274. The cubic root of 81131153 is about 432.9082702995.

It can be divided in two parts, 8113115 and 3, that added together give a palindrome (8113118).

The spelling of 81131153 in words is "eighty-one million, one hundred thirty-one thousand, one hundred fifty-three".