81925534 has 8 divisors (see below), whose sum is σ = 123599160. Its totient is φ = 40725816.

The previous prime is 81925531. The next prime is 81925561. The reversal of 81925534 is 43552918.

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

It is a junction number, because it is equal to n+sod(n) for n = 81925493 and 81925502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81925531) 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 3 ways as a sum of consecutive naturals, for example, 118044 + ... + 118735.

It is an arithmetic number, because the mean of its divisors is an integer number (15449895).

Almost surely, 2^81925534 is an apocalyptic number.

81925534 is a deficient number, since it is larger than the sum of its proper divisors (41673626).

81925534 is a wasteful number, since it uses less digits than its factorization.

81925534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236954.

The product of its digits is 43200, while the sum is 37.

The square root of 81925534 is about 9051.2725072224. The cubic root of 81925534 is about 434.3165981141.

The spelling of 81925534 in words is "eighty-one million, nine hundred twenty-five thousand, five hundred thirty-four".