81148727 has 8 divisors (see below), whose sum is σ = 89977872. Its totient is φ = 72561600.

The previous prime is 81148709. The next prime is 81148741. The reversal of 81148727 is 72784118.

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 81148727 - 2⁶ = 81148663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81148787) 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, 59798 + ... + 61139.

It is an arithmetic number, because the mean of its divisors is an integer number (11247234).

Almost surely, 2^81148727 is an apocalyptic number.

81148727 is a deficient number, since it is larger than the sum of its proper divisors (8829145).

81148727 is a wasteful number, since it uses less digits than its factorization.

81148727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121009.

The product of its digits is 25088, while the sum is 38.

The square root of 81148727 is about 9008.2588217702. The cubic root of 81148727 is about 432.9395257848.

The spelling of 81148727 in words is "eighty-one million, one hundred forty-eight thousand, seven hundred twenty-seven".