81252545 has 8 divisors (see below), whose sum is σ = 106367040. Its totient is φ = 59092720.

The previous prime is 81252539. The next prime is 81252547. The reversal of 81252545 is 54525218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81252545 - 2¹⁸ = 80990401 is a prime.

It is a super-3 number, since 3×81252545³ (a number of 25 digits) contains 333 as substring.

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 (81252547) 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 7 ways as a sum of consecutive naturals, for example, 738605 + ... + 738714.

It is an arithmetic number, because the mean of its divisors is an integer number (13295880).

Almost surely, 2^81252545 is an apocalyptic number.

It is an amenable number.

81252545 is a deficient number, since it is larger than the sum of its proper divisors (25114495).

81252545 is a wasteful number, since it uses less digits than its factorization.

81252545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1477335.

The product of its digits is 16000, while the sum is 32.

The square root of 81252545 is about 9014.0193587545. The cubic root of 81252545 is about 433.1240748356.

The spelling of 81252545 in words is "eighty-one million, two hundred fifty-two thousand, five hundred forty-five".