81364541 has 8 divisors (see below), whose sum is σ = 84162624. Its totient is φ = 78605280.

The previous prime is 81364531. The next prime is 81364583. The reversal of 81364541 is 14546318.

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 81364541 - 2⁶ = 81364477 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81364498 and 81364507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81364531) 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, 5411 + ... + 13856.

It is an arithmetic number, because the mean of its divisors is an integer number (10520328).

Almost surely, 2^81364541 is an apocalyptic number.

It is an amenable number.

81364541 is a deficient number, since it is larger than the sum of its proper divisors (2798083).

81364541 is a wasteful number, since it uses less digits than its factorization.

81364541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19411.

The product of its digits is 11520, while the sum is 32.

The square root of 81364541 is about 9020.2295425338. The cubic root of 81364541 is about 433.3229850915.

The spelling of 81364541 in words is "eighty-one million, three hundred sixty-four thousand, five hundred forty-one".