200161261 has 2 divisors, whose sum is σ = 200161262. Its totient is φ = 200161260.

The previous prime is 200161253. The next prime is 200161289. The reversal of 200161261 is 162161002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199685161 + 476100 = 14131^2 + 690^2 .

It is a cyclic number.

It is not a de Polignac number, because 200161261 - 2³ = 200161253 is a prime.

It is a super-2 number, since 2×200161261² = 80129060810220242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200161211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100080630 + 100080631.

It is an arithmetic number, because the mean of its divisors is an integer number (100080631).

Almost surely, 2^200161261 is an apocalyptic number.

It is an amenable number.

200161261 is a deficient number, since it is larger than the sum of its proper divisors (1).

200161261 is an equidigital number, since it uses as much as digits as its factorization.

200161261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 200161261 is about 14147.8359122517. The cubic root of 200161261 is about 584.9606820922.

The spelling of 200161261 in words is "two hundred million, one hundred sixty-one thousand, two hundred sixty-one".