81052545 has 32 divisors (see below), whose sum is σ = 148891392. Its totient is φ = 36882432.

The previous prime is 81052523. The next prime is 81052547. The reversal of 81052545 is 54525018.

It is not a de Polignac number, because 81052545 - 2¹⁰ = 81051521 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (81052547) 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 31 ways as a sum of consecutive naturals, for example, 22809 + ... + 26121.

It is an arithmetic number, because the mean of its divisors is an integer number (4652856).

Almost surely, 2^81052545 is an apocalyptic number.

It is an amenable number.

81052545 is a deficient number, since it is larger than the sum of its proper divisors (67838847).

81052545 is a wasteful number, since it uses less digits than its factorization.

81052545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3561.

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 81052545 is about 9002.9186934016. The cubic root of 81052545 is about 432.7684101326.

The spelling of 81052545 in words is "eighty-one million, fifty-two thousand, five hundred forty-five".