213134557 has 2 divisors, whose sum is σ = 213134558. Its totient is φ = 213134556.

The previous prime is 213134539. The next prime is 213134561. The reversal of 213134557 is 755431312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212751396 + 383161 = 14586^2 + 619^2 .

It is a cyclic number.

It is not a de Polignac number, because 213134557 - 2⁷ = 213134429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213134057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106567278 + 106567279.

It is an arithmetic number, because the mean of its divisors is an integer number (106567279).

Almost surely, 2^213134557 is an apocalyptic number.

It is an amenable number.

213134557 is a deficient number, since it is larger than the sum of its proper divisors (1).

213134557 is an equidigital number, since it uses as much as digits as its factorization.

213134557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12600, while the sum is 31.

The square root of 213134557 is about 14599.1286383811. The cubic root of 213134557 is about 597.3349924539.

Adding to 213134557 its reverse (755431312), we get a palindrome (968565869).

The spelling of 213134557 in words is "two hundred thirteen million, one hundred thirty-four thousand, five hundred fifty-seven".