81158153 has 8 divisors (see below), whose sum is σ = 88895880. Its totient is φ = 73749760.

The previous prime is 81158149. The next prime is 81158171. The reversal of 81158153 is 35185118.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 28334329 + 52823824 = 5323^2 + 7268^2 .

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 81158153 - 2² = 81158149 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81158113) 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, 81818 + ... + 82803.

It is an arithmetic number, because the mean of its divisors is an integer number (11111985).

Almost surely, 2^81158153 is an apocalyptic number.

It is an amenable number.

81158153 is a deficient number, since it is larger than the sum of its proper divisors (7737727).

81158153 is a wasteful number, since it uses less digits than its factorization.

81158153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164667.

The product of its digits is 4800, while the sum is 32.

The square root of 81158153 is about 9008.7819931442. The cubic root of 81158153 is about 432.9562881343.

The spelling of 81158153 in words is "eighty-one million, one hundred fifty-eight thousand, one hundred fifty-three".