81658126 has 16 divisors (see below), whose sum is σ = 135619200. Its totient is φ = 36562680.

The previous prime is 81658121. The next prime is 81658141. The reversal of 81658126 is 62185618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81658121) 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, 26226 + ... + 29173.

It is an arithmetic number, because the mean of its divisors is an integer number (8476200).

Almost surely, 2^81658126 is an apocalyptic number.

81658126 is a deficient number, since it is larger than the sum of its proper divisors (53961074).

81658126 is a wasteful number, since it uses less digits than its factorization.

81658126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55479.

The product of its digits is 23040, while the sum is 37.

The square root of 81658126 is about 9036.4885879417. The cubic root of 81658126 is about 433.8435411874.

The spelling of 81658126 in words is "eighty-one million, six hundred fifty-eight thousand, one hundred twenty-six".