81261324 has 36 divisors (see below), whose sum is σ = 210965664. Its totient is φ = 26354592.

The previous prime is 81261311. The next prime is 81261329. The reversal of 81261324 is 42316218.

81261324 is a `hidden beast` number, since 81 + 261 + 324 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (81261329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29172 + ... + 31835.

Almost surely, 2^81261324 is an apocalyptic number.

It is an amenable number.

81261324 is an abundant number, since it is smaller than the sum of its proper divisors (129704340).

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

81261324 is a wasteful number, since it uses less digits than its factorization.

81261324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61054 (or 61049 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 81261324 is about 9014.5063092773. The cubic root of 81261324 is about 433.1396733596.

The spelling of 81261324 in words is "eighty-one million, two hundred sixty-one thousand, three hundred twenty-four".