161627201 has 2 divisors, whose sum is σ = 161627202. Its totient is φ = 161627200.

The previous prime is 161627197. The next prime is 161627251. The reversal of 161627201 is 102726161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93993025 + 67634176 = 9695^2 + 8224^2 .

It is a cyclic number.

It is not a de Polignac number, because 161627201 - 2² = 161627197 is a prime.

It is a super-2 number, since 2×161627201² = 52246704206188802, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161627251) 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, 80813600 + 80813601.

It is an arithmetic number, because the mean of its divisors is an integer number (80813601).

Almost surely, 2^161627201 is an apocalyptic number.

It is an amenable number.

161627201 is a deficient number, since it is larger than the sum of its proper divisors (1).

161627201 is an equidigital number, since it uses as much as digits as its factorization.

161627201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 161627201 is about 12713.2686984898. The cubic root of 161627201 is about 544.7176957271.

The spelling of 161627201 in words is "one hundred sixty-one million, six hundred twenty-seven thousand, two hundred one".