81000545 has 8 divisors (see below), whose sum is σ = 97560960. Its totient is φ = 64560240.

The previous prime is 81000541. The next prime is 81000571. The reversal of 81000545 is 54500018.

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

It is not a de Polignac number, because 81000545 - 2² = 81000541 is a prime.

It is a super-2 number, since 2×81000545² = 13122176580594050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81000545.

It is not an unprimeable number, because it can be changed into a prime (81000541) 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, 28535 + ... + 31244.

It is an arithmetic number, because the mean of its divisors is an integer number (12195120).

Almost surely, 2^81000545 is an apocalyptic number.

It is an amenable number.

81000545 is a deficient number, since it is larger than the sum of its proper divisors (16560415).

81000545 is a wasteful number, since it uses less digits than its factorization.

81000545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60055.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 81000545 is about 9000.0302777268. The cubic root of 81000545 is about 432.6758414925.

The spelling of 81000545 in words is "eighty-one million, five hundred forty-five", and thus it is an aban number.