213525517 has 2 divisors, whose sum is σ = 213525518. Its totient is φ = 213525516.

The previous prime is 213525509. The next prime is 213525523. The reversal of 213525517 is 715525312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205606921 + 7918596 = 14339^2 + 2814^2 .

It is a cyclic number.

It is not a de Polignac number, because 213525517 - 2³ = 213525509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213525527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106762758 + 106762759.

It is an arithmetic number, because the mean of its divisors is an integer number (106762759).

Almost surely, 2^213525517 is an apocalyptic number.

It is an amenable number.

213525517 is a deficient number, since it is larger than the sum of its proper divisors (1).

213525517 is an equidigital number, since it uses as much as digits as its factorization.

213525517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10500, while the sum is 31.

The square root of 213525517 is about 14612.5123438784. The cubic root of 213525517 is about 597.7000066873.

The spelling of 213525517 in words is "two hundred thirteen million, five hundred twenty-five thousand, five hundred seventeen".