213541409 has 2 divisors, whose sum is σ = 213541410. Its totient is φ = 213541408.

The previous prime is 213541379. The next prime is 213541417. The reversal of 213541409 is 904145312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132181009 + 81360400 = 11497^2 + 9020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213541409 is a prime.

It is a Chen prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (213541429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106770704 + 106770705.

It is an arithmetic number, because the mean of its divisors is an integer number (106770705).

Almost surely, 2^213541409 is an apocalyptic number.

It is an amenable number.

213541409 is a deficient number, since it is larger than the sum of its proper divisors (1).

213541409 is an equidigital number, since it uses as much as digits as its factorization.

213541409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 213541409 is about 14613.0561143109. The cubic root of 213541409 is about 597.7148345995.

The spelling of 213541409 in words is "two hundred thirteen million, five hundred forty-one thousand, four hundred nine".