81828201 has 32 divisors (see below), whose sum is σ = 137928448. Its totient is φ = 41990400.

The previous prime is 81828151. The next prime is 81828211. The reversal of 81828201 is 10282818.

It is not a de Polignac number, because 81828201 - 2⁷ = 81828073 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81828211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6051 + ... + 14151.

It is an arithmetic number, because the mean of its divisors is an integer number (4310264).

Almost surely, 2^81828201 is an apocalyptic number.

It is an amenable number.

81828201 is a deficient number, since it is larger than the sum of its proper divisors (56100247).

81828201 is a wasteful number, since it uses less digits than its factorization.

81828201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8161.

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 81828201 is about 9045.8941514922. The cubic root of 81828201 is about 434.1445309224.

The spelling of 81828201 in words is "eighty-one million, eight hundred twenty-eight thousand, two hundred one".