81051206 has 12 divisors (see below), whose sum is σ = 129149988. Its totient is φ = 38141472.

The previous prime is 81051203. The next prime is 81051211. The reversal of 81051206 is 60215018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81051203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69536 + ... + 70691.

It is an arithmetic number, because the mean of its divisors is an integer number (10762499).

Almost surely, 2^81051206 is an apocalyptic number.

81051206 is a deficient number, since it is larger than the sum of its proper divisors (48098782).

81051206 is a wasteful number, since it uses less digits than its factorization.

81051206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140263 (or 140246 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 81051206 is about 9002.8443283220. The cubic root of 81051206 is about 432.7660269868.

The spelling of 81051206 in words is "eighty-one million, fifty-one thousand, two hundred six".