81176201 has 2 divisors, whose sum is σ = 81176202. Its totient is φ = 81176200.

The previous prime is 81176159. The next prime is 81176203. The reversal of 81176201 is 10267118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41473600 + 39702601 = 6440^2 + 6301^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81176201 is a prime.

It is a Sophie Germain prime.

Together with 81176203, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (81176203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40588100 + 40588101.

It is an arithmetic number, because the mean of its divisors is an integer number (40588101).

Almost surely, 2^81176201 is an apocalyptic number.

It is an amenable number.

81176201 is a deficient number, since it is larger than the sum of its proper divisors (1).

81176201 is an equidigital number, since it uses as much as digits as its factorization.

81176201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 81176201 is about 9009.7836267027. The cubic root of 81176201 is about 432.9883794509.

The spelling of 81176201 in words is "eighty-one million, one hundred seventy-six thousand, two hundred one".