213061553 has 2 divisors, whose sum is σ = 213061554. Its totient is φ = 213061552.

The previous prime is 213061549. The next prime is 213061571. The reversal of 213061553 is 355160312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159946609 + 53114944 = 12647^2 + 7288^2 .

It is a cyclic number.

It is not a de Polignac number, because 213061553 - 2² = 213061549 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (213060553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106530776 + 106530777.

It is an arithmetic number, because the mean of its divisors is an integer number (106530777).

Almost surely, 2^213061553 is an apocalyptic number.

It is an amenable number.

213061553 is a deficient number, since it is larger than the sum of its proper divisors (1).

213061553 is an equidigital number, since it uses as much as digits as its factorization.

213061553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 213061553 is about 14596.6281380324. The cubic root of 213061553 is about 597.2667838626.

The spelling of 213061553 in words is "two hundred thirteen million, sixty-one thousand, five hundred fifty-three".