202161541 has 2 divisors, whose sum is σ = 202161542. Its totient is φ = 202161540.

The previous prime is 202161527. The next prime is 202161593. The reversal of 202161541 is 145161202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109809441 + 92352100 = 10479^2 + 9610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202161541 is a prime.

It is a Chen prime.

It is equal to p_11192053 and since 202161541 and 11192053 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202161041) 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, 101080770 + 101080771.

It is an arithmetic number, because the mean of its divisors is an integer number (101080771).

Almost surely, 2^202161541 is an apocalyptic number.

It is an amenable number.

202161541 is a deficient number, since it is larger than the sum of its proper divisors (1).

202161541 is an equidigital number, since it uses as much as digits as its factorization.

202161541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 202161541 is about 14218.3522603711. The cubic root of 202161541 is about 586.9027977585.

The spelling of 202161541 in words is "two hundred two million, one hundred sixty-one thousand, five hundred forty-one".