81146577 has 8 divisors (see below), whose sum is σ = 108239040. Its totient is φ = 54075920.

The previous prime is 81146573. The next prime is 81146609. The reversal of 81146577 is 77564118.

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 81146577 - 2² = 81146573 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81146573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7924 + ... + 15002.

It is an arithmetic number, because the mean of its divisors is an integer number (13529880).

Almost surely, 2^81146577 is an apocalyptic number.

It is an amenable number.

81146577 is a deficient number, since it is larger than the sum of its proper divisors (27092463).

81146577 is a wasteful number, since it uses less digits than its factorization.

81146577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10903.

The product of its digits is 47040, while the sum is 39.

The square root of 81146577 is about 9008.1394860426. The cubic root of 81146577 is about 432.9357022366.

The spelling of 81146577 in words is "eighty-one million, one hundred forty-six thousand, five hundred seventy-seven".