81151746 has 16 divisors (see below), whose sum is σ = 174788544. Its totient is φ = 24969744.

The previous prime is 81151739. The next prime is 81151747. The reversal of 81151746 is 64715118.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81151747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 520126 + ... + 520281.

It is an arithmetic number, because the mean of its divisors is an integer number (10924284).

Almost surely, 2^81151746 is an apocalyptic number.

81151746 is an abundant number, since it is smaller than the sum of its proper divisors (93636798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81151746 is a wasteful number, since it uses less digits than its factorization.

81151746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040425.

The product of its digits is 6720, while the sum is 33.

The square root of 81151746 is about 9008.4263886652. The cubic root of 81151746 is about 432.9448946438.

The spelling of 81151746 in words is "eighty-one million, one hundred fifty-one thousand, seven hundred forty-six".