81329452 has 6 divisors (see below), whose sum is σ = 142326548. Its totient is φ = 40664724.

The previous prime is 81329429. The next prime is 81329453. The reversal of 81329452 is 25492318.

It is a super-2 number, since 2×81329452² = 13228959525240608, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81329453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10166178 + ... + 10166185.

Almost surely, 2^81329452 is an apocalyptic number.

It is an amenable number.

81329452 is a deficient number, since it is larger than the sum of its proper divisors (60997096).

81329452 is a wasteful number, since it uses less digits than its factorization.

81329452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20332367 (or 20332365 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 81329452 is about 9018.2843157665. The cubic root of 81329452 is about 433.2606849941.

The spelling of 81329452 in words is "eighty-one million, three hundred twenty-nine thousand, four hundred fifty-two".