81136150 has 24 divisors (see below), whose sum is σ = 151418880. Its totient is φ = 32345760.

The previous prime is 81136103. The next prime is 81136169. The reversal of 81136150 is 5163118.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 13291 + ... + 18409.

It is an arithmetic number, because the mean of its divisors is an integer number (6309120).

Almost surely, 2^81136150 is an apocalyptic number.

81136150 is a deficient number, since it is larger than the sum of its proper divisors (70282730).

81136150 is a wasteful number, since it uses less digits than its factorization.

81136150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5448 (or 5443 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 81136150 is about 9007.5607130899. The cubic root of 81136150 is about 432.9171579591.

Adding to 81136150 its reverse (5163118), we get a palindrome (86299268).

The spelling of 81136150 in words is "eighty-one million, one hundred thirty-six thousand, one hundred fifty".