81925135 has 8 divisors (see below), whose sum is σ = 99922176. Its totient is φ = 64465440.

The previous prime is 81925111. The next prime is 81925139. The reversal of 81925135 is 53152918.

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

It is not a de Polignac number, because 81925135 - 2²¹ = 79827983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81925135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81925139) 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 7 ways as a sum of consecutive naturals, for example, 133999 + ... + 134608.

It is an arithmetic number, because the mean of its divisors is an integer number (12490272).

Almost surely, 2^81925135 is an apocalyptic number.

81925135 is a deficient number, since it is larger than the sum of its proper divisors (17997041).

81925135 is a wasteful number, since it uses less digits than its factorization.

81925135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268673.

The product of its digits is 10800, while the sum is 34.

The square root of 81925135 is about 9051.2504660958. The cubic root of 81925135 is about 434.3158930323.

The spelling of 81925135 in words is "eighty-one million, nine hundred twenty-five thousand, one hundred thirty-five".