81383057 has 8 divisors (see below), whose sum is σ = 93204096. Its totient is φ = 69610752.

The previous prime is 81383053. The next prime is 81383059. The reversal of 81383057 is 75038318.

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 81383057 - 2² = 81383053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81383051) 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, 8528 + ... + 15345.

It is an arithmetic number, because the mean of its divisors is an integer number (11650512).

Almost surely, 2^81383057 is an apocalyptic number.

It is an amenable number.

81383057 is a deficient number, since it is larger than the sum of its proper divisors (11821039).

81383057 is a wasteful number, since it uses less digits than its factorization.

81383057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24367.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 81383057 is about 9021.2558438390. The cubic root of 81383057 is about 433.3558528073.

The spelling of 81383057 in words is "eighty-one million, three hundred eighty-three thousand, fifty-seven".