81451132 has 18 divisors (see below), whose sum is σ = 165811632. Its totient is φ = 34907544.

The previous prime is 81451127. The next prime is 81451177. The reversal of 81451132 is 23115418.

It is a junction number, because it is equal to n+sod(n) for n = 81451097 and 81451106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 207588 + ... + 207979.

Almost surely, 2^81451132 is an apocalyptic number.

It is an amenable number.

81451132 is an abundant number, since it is smaller than the sum of its proper divisors (84360500).

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

81451132 is a wasteful number, since it uses less digits than its factorization.

81451132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415585 (or 415576 counting only the distinct ones).

The product of its digits is 960, while the sum is 25.

The square root of 81451132 is about 9025.0280885989. The cubic root of 81451132 is about 433.4766497686.

The spelling of 81451132 in words is "eighty-one million, four hundred fifty-one thousand, one hundred thirty-two".