213561541 has 2 divisors, whose sum is σ = 213561542. Its totient is φ = 213561540.

The previous prime is 213561529. The next prime is 213561583. The reversal of 213561541 is 145165312.

213561541 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200930625 + 12630916 = 14175^2 + 3554^2 .

It is a cyclic number.

It is not a de Polignac number, because 213561541 - 2²¹ = 211464389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213561841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106780770 + 106780771.

It is an arithmetic number, because the mean of its divisors is an integer number (106780771).

Almost surely, 2^213561541 is an apocalyptic number.

It is an amenable number.

213561541 is a deficient number, since it is larger than the sum of its proper divisors (1).

213561541 is an equidigital number, since it uses as much as digits as its factorization.

213561541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 28.

The square root of 213561541 is about 14613.7449341365. The cubic root of 213561541 is about 597.7336175559.

The spelling of 213561541 in words is "two hundred thirteen million, five hundred sixty-one thousand, five hundred forty-one".