81139114 has 8 divisors (see below), whose sum is σ = 139095648. Its totient is φ = 34773900.

The previous prime is 81139111. The next prime is 81139133. The reversal of 81139114 is 41193118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81139111) 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 3 ways as a sum of consecutive naturals, for example, 2897812 + ... + 2897839.

It is an arithmetic number, because the mean of its divisors is an integer number (17386956).

Almost surely, 2^81139114 is an apocalyptic number.

81139114 is a deficient number, since it is larger than the sum of its proper divisors (57956534).

81139114 is a wasteful number, since it uses less digits than its factorization.

81139114 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5795660.

The product of its digits is 864, while the sum is 28.

The square root of 81139114 is about 9007.7252400370. The cubic root of 81139114 is about 432.9224295544.

The spelling of 81139114 in words is "eighty-one million, one hundred thirty-nine thousand, one hundred fourteen".