81252534 has 16 divisors (see below), whose sum is σ = 177278400. Its totient is φ = 24621960.

The previous prime is 81252511. The next prime is 81252539. The reversal of 81252534 is 43525218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81252539) 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, 615484 + ... + 615615.

It is an arithmetic number, because the mean of its divisors is an integer number (11079900).

Almost surely, 2^81252534 is an apocalyptic number.

81252534 is an abundant number, since it is smaller than the sum of its proper divisors (96025866).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81252534 is a wasteful number, since it uses less digits than its factorization.

81252534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231115.

The product of its digits is 9600, while the sum is 30.

The square root of 81252534 is about 9014.0187485938. The cubic root of 81252534 is about 433.1240552901.

The spelling of 81252534 in words is "eighty-one million, two hundred fifty-two thousand, five hundred thirty-four".