102201181 has 4 divisors (see below), whose sum is σ = 102222972. Its totient is φ = 102179392.

The previous prime is 102201173. The next prime is 102201217. The reversal of 102201181 is 181102201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18844281 + 83356900 = 4341^2 + 9130^2 .

It is a cyclic number.

It is not a de Polignac number, because 102201181 - 2³ = 102201173 is a prime.

It is a super-2 number, since 2×102201181² = 20890162795589522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102201101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 646 + ... + 14311.

It is an arithmetic number, because the mean of its divisors is an integer number (25555743).

Almost surely, 2^102201181 is an apocalyptic number.

It is an amenable number.

102201181 is a deficient number, since it is larger than the sum of its proper divisors (21791).

102201181 is an equidigital number, since it uses as much as digits as its factorization.

102201181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21790.

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 102201181 is about 10109.4599756861. The cubic root of 102201181 is about 467.5398553342.

Adding to 102201181 its reverse (181102201), we get a palindrome (283303382).

The spelling of 102201181 in words is "one hundred two million, two hundred one thousand, one hundred eighty-one".