81751150 has 48 divisors (see below), whose sum is σ = 164926944. Its totient is φ = 29969280.

The previous prime is 81751139. The next prime is 81751157. The reversal of 81751150 is 5115718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81751157) 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 23 ways as a sum of consecutive naturals, for example, 112087 + ... + 112813.

It is an arithmetic number, because the mean of its divisors is an integer number (3435978).

Almost surely, 2^81751150 is an apocalyptic number.

81751150 is an abundant number, since it is smaller than the sum of its proper divisors (83175794).

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

81751150 is a wasteful number, since it uses less digits than its factorization.

81751150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925 (or 920 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 28.

The square root of 81751150 is about 9041.6342549342. The cubic root of 81751150 is about 434.0082218635.

Adding to 81751150 its reverse (5115718), we get a palindrome (86866868).

The spelling of 81751150 in words is "eighty-one million, seven hundred fifty-one thousand, one hundred fifty".