81139346 has 8 divisors (see below), whose sum is σ = 122597820. Its totient is φ = 40273408.

The previous prime is 81139321. The next prime is 81139349. The reversal of 81139346 is 64393118.

It can be written as a sum of positive squares in 2 ways, for example, as 75498721 + 5640625 = 8689^2 + 2375^2 .

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 (81139349) 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, 147791 + ... + 148338.

Almost surely, 2^81139346 is an apocalyptic number.

81139346 is a deficient number, since it is larger than the sum of its proper divisors (41458474).

81139346 is a wasteful number, since it uses less digits than its factorization.

81139346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296268.

The product of its digits is 15552, while the sum is 35.

The square root of 81139346 is about 9007.7381178629. The cubic root of 81139346 is about 432.9228421704.

The spelling of 81139346 in words is "eighty-one million, one hundred thirty-nine thousand, three hundred forty-six".