81124358 has 16 divisors (see below), whose sum is σ = 145117440. Its totient is φ = 33255816.

The previous prime is 81124349. The next prime is 81124361. The reversal of 81124358 is 85342118.

It is a super-2 number, since 2×81124358² = 13162322921824328, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 125648 + ... + 126291.

It is an arithmetic number, because the mean of its divisors is an integer number (9069840).

Almost surely, 2^81124358 is an apocalyptic number.

81124358 is a deficient number, since it is larger than the sum of its proper divisors (63993082).

81124358 is a wasteful number, since it uses less digits than its factorization.

81124358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251971.

The product of its digits is 7680, while the sum is 32.

The square root of 81124358 is about 9006.9061280775. The cubic root of 81124358 is about 432.8961841332.

The spelling of 81124358 in words is "eighty-one million, one hundred twenty-four thousand, three hundred fifty-eight".