81025232 has 10 divisors (see below), whose sum is σ = 156986418. Its totient is φ = 40512608.

The previous prime is 81025207. The next prime is 81025237. The reversal of 81025232 is 23252018.

It can be written as a sum of positive squares in only one way, i.e., 67305616 + 13719616 = 8204^2 + 3704^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81025198 and 81025207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81025237) 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 as a sum of consecutive naturals, namely, 2532023 + ... + 2532054.

Almost surely, 2^81025232 is an apocalyptic number.

It is an amenable number.

81025232 is a deficient number, since it is larger than the sum of its proper divisors (75961186).

81025232 is a wasteful number, since it uses less digits than its factorization.

81025232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5064085 (or 5064079 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 81025232 is about 9001.4016686292. The cubic root of 81025232 is about 432.7197933924.

The spelling of 81025232 in words is "eighty-one million, twenty-five thousand, two hundred thirty-two".