213357409 has 2 divisors, whose sum is σ = 213357410. Its totient is φ = 213357408.

The previous prime is 213357377. The next prime is 213357449. The reversal of 213357409 is 904753312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126495009 + 86862400 = 11247^2 + 9320^2 .

It is a cyclic number.

It is not a de Polignac number, because 213357409 - 2⁵ = 213357377 is a prime.

It is not a weakly prime, because it can be changed into another prime (213357449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106678704 + 106678705.

It is an arithmetic number, because the mean of its divisors is an integer number (106678705).

Almost surely, 2^213357409 is an apocalyptic number.

It is an amenable number.

213357409 is a deficient number, since it is larger than the sum of its proper divisors (1).

213357409 is an equidigital number, since it uses as much as digits as its factorization.

213357409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 213357409 is about 14606.7590176603. The cubic root of 213357409 is about 597.5431096969.

The spelling of 213357409 in words is "two hundred thirteen million, three hundred fifty-seven thousand, four hundred nine".