71621201 has 2 divisors, whose sum is σ = 71621202. Its totient is φ = 71621200.

The previous prime is 71621197. The next prime is 71621227. The reversal of 71621201 is 10212617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66846976 + 4774225 = 8176^2 + 2185^2 .

It is an emirp because it is prime and its reverse (10212617) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71621201 - 2² = 71621197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (71621261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35810600 + 35810601.

It is an arithmetic number, because the mean of its divisors is an integer number (35810601).

Almost surely, 2^71621201 is an apocalyptic number.

It is an amenable number.

71621201 is a deficient number, since it is larger than the sum of its proper divisors (1).

71621201 is an equidigital number, since it uses as much as digits as its factorization.

71621201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 71621201 is about 8462.9309934561. The cubic root of 71621201 is about 415.2859131996.

Adding to 71621201 its reverse (10212617), we get a palindrome (81833818).

The spelling of 71621201 in words is "seventy-one million, six hundred twenty-one thousand, two hundred one".