81383801 has 4 divisors (see below), whose sum is σ = 81405072. Its totient is φ = 81362532.

The previous prime is 81383791. The next prime is 81383803. The reversal of 81383801 is 10838318.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81383801 - 2⁶ = 81383737 is a prime.

It is a super-4 number, since 4×81383801⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81383803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3131 + ... + 13136.

It is an arithmetic number, because the mean of its divisors is an integer number (20351268).

Almost surely, 2^81383801 is an apocalyptic number.

It is an amenable number.

81383801 is a deficient number, since it is larger than the sum of its proper divisors (21271).

81383801 is a wasteful number, since it uses less digits than its factorization.

81383801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21270.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 81383801 is about 9021.2970796887. The cubic root of 81383801 is about 433.3571733761.

The spelling of 81383801 in words is "eighty-one million, three hundred eighty-three thousand, eight hundred one".