81910153 has 16 divisors (see below), whose sum is σ = 95026176. Its totient is φ = 69981120.

The previous prime is 81910151. The next prime is 81910163. The reversal of 81910153 is 35101918.

It is a cyclic number.

It is not a de Polignac number, because 81910153 - 2¹ = 81910151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81910151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4851 + ... + 13687.

It is an arithmetic number, because the mean of its divisors is an integer number (5939136).

Almost surely, 2^81910153 is an apocalyptic number.

It is an amenable number.

81910153 is a deficient number, since it is larger than the sum of its proper divisors (13116023).

81910153 is a wasteful number, since it uses less digits than its factorization.

81910153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8904.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 81910153 is about 9050.4228078030. The cubic root of 81910153 is about 434.2894163496.

The spelling of 81910153 in words is "eighty-one million, nine hundred ten thousand, one hundred fifty-three".