81148206 has 16 divisors (see below), whose sum is σ = 167893200. Its totient is φ = 26116608.

The previous prime is 81148159. The next prime is 81148213. The reversal of 81148206 is 60284118.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233011 + ... + 233358.

It is an arithmetic number, because the mean of its divisors is an integer number (10493325).

Almost surely, 2^81148206 is an apocalyptic number.

81148206 is an abundant number, since it is smaller than the sum of its proper divisors (86744994).

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

81148206 is a wasteful number, since it uses less digits than its factorization.

81148206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466403.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 81148206 is about 9008.2299038157. The cubic root of 81148206 is about 432.9385992475.

The spelling of 81148206 in words is "eighty-one million, one hundred forty-eight thousand, two hundred six".