81189345 has 8 divisors (see below), whose sum is σ = 129902976. Its totient is φ = 43300976.

The previous prime is 81189343. The next prime is 81189371. The reversal of 81189345 is 54398118.

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

It is a cyclic number.

It is not a de Polignac number, because 81189345 - 2¹ = 81189343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81189343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2706297 + ... + 2706326.

It is an arithmetic number, because the mean of its divisors is an integer number (16237872).

Almost surely, 2^81189345 is an apocalyptic number.

It is an amenable number.

81189345 is a deficient number, since it is larger than the sum of its proper divisors (48713631).

81189345 is a wasteful number, since it uses less digits than its factorization.

81189345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5412631.

The product of its digits is 34560, while the sum is 39.

The square root of 81189345 is about 9010.5130264597. The cubic root of 81189345 is about 433.0117479260.

The spelling of 81189345 in words is "eighty-one million, one hundred eighty-nine thousand, three hundred forty-five".