81314133 has 4 divisors (see below), whose sum is σ = 108418848. Its totient is φ = 54209420.

The previous prime is 81314119. The next prime is 81314141. The reversal of 81314133 is 33141318.

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 81314133 - 2⁴ = 81314117 is a prime.

It is a super-2 number, since 2×81314133² = 13223976451083378, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81314113) 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, 13552353 + ... + 13552358.

It is an arithmetic number, because the mean of its divisors is an integer number (27104712).

Almost surely, 2^81314133 is an apocalyptic number.

It is an amenable number.

81314133 is a deficient number, since it is larger than the sum of its proper divisors (27104715).

81314133 is a wasteful number, since it uses less digits than its factorization.

81314133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27104714.

The product of its digits is 864, while the sum is 24.

The square root of 81314133 is about 9017.4349457038. The cubic root of 81314133 is about 433.2334806746.

The spelling of 81314133 in words is "eighty-one million, three hundred fourteen thousand, one hundred thirty-three".