81127347 has 32 divisors (see below), whose sum is σ = 127767552. Its totient is φ = 44820864.

The previous prime is 81127339. The next prime is 81127351. The reversal of 81127347 is 74372118.

It is a happy number.

It is not a de Polignac number, because 81127347 - 2³ = 81127339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81127307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204153 + ... + 204549.

It is an arithmetic number, because the mean of its divisors is an integer number (3992736).

Almost surely, 2^81127347 is an apocalyptic number.

81127347 is a deficient number, since it is larger than the sum of its proper divisors (46640205).

81127347 is a wasteful number, since it uses less digits than its factorization.

81127347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707.

The product of its digits is 9408, while the sum is 33.

The square root of 81127347 is about 9007.0720547801. The cubic root of 81127347 is about 432.9015007066.

The spelling of 81127347 in words is "eighty-one million, one hundred twenty-seven thousand, three hundred forty-seven".