81140347 has 16 divisors (see below), whose sum is σ = 86054400. Its totient is φ = 76396320.

The previous prime is 81140341. The next prime is 81140351. The reversal of 81140347 is 74304118.

It is a cyclic number.

It is not a de Polignac number, because 81140347 - 2¹⁹ = 80616059 is a prime.

It is a super-2 number, since 2×81140347² = 13167511822560818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81140341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244972 + ... + 245302.

It is an arithmetic number, because the mean of its divisors is an integer number (5378400).

Almost surely, 2^81140347 is an apocalyptic number.

81140347 is a deficient number, since it is larger than the sum of its proper divisors (4914053).

81140347 is a wasteful number, since it uses less digits than its factorization.

81140347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 81140347 is about 9007.7936810298. The cubic root of 81140347 is about 432.9246224575.

The spelling of 81140347 in words is "eighty-one million, one hundred forty thousand, three hundred forty-seven".