213154549 has 2 divisors, whose sum is σ = 213154550. Its totient is φ = 213154548.

The previous prime is 213154523. The next prime is 213154573. The reversal of 213154549 is 945451312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155500900 + 57653649 = 12470^2 + 7593^2 .

It is a cyclic number.

It is not a de Polignac number, because 213154549 - 2⁷ = 213154421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213154519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106577274 + 106577275.

It is an arithmetic number, because the mean of its divisors is an integer number (106577275).

Almost surely, 2^213154549 is an apocalyptic number.

It is an amenable number.

213154549 is a deficient number, since it is larger than the sum of its proper divisors (1).

213154549 is an equidigital number, since it uses as much as digits as its factorization.

213154549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 34.

The square root of 213154549 is about 14599.8133207243. The cubic root of 213154549 is about 597.3536685240.

The spelling of 213154549 in words is "two hundred thirteen million, one hundred fifty-four thousand, five hundred forty-nine".