81047122 has 32 divisors (see below), whose sum is σ = 138499200. Its totient is φ = 35261568.

The previous prime is 81047107. The next prime is 81047137. The reversal of 81047122 is 22174018.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81047107) and next prime (81047137).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 177118 + ... + 177574.

It is an arithmetic number, because the mean of its divisors is an integer number (4328100).

Almost surely, 2^81047122 is an apocalyptic number.

81047122 is a deficient number, since it is larger than the sum of its proper divisors (57452078).

81047122 is a wasteful number, since it uses less digits than its factorization.

81047122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 81047122 is about 9002.6175082584. The cubic root of 81047122 is about 432.7587581410.

The spelling of 81047122 in words is "eighty-one million, forty-seven thousand, one hundred twenty-two".