215212513 has 2 divisors, whose sum is σ = 215212514. Its totient is φ = 215212512.

The previous prime is 215212499. The next prime is 215212531. The reversal of 215212513 is 315212512.

Together with next prime (215212531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182574144 + 32638369 = 13512^2 + 5713^2 .

It is a cyclic number.

It is not a de Polignac number, because 215212513 - 2⁹ = 215212001 is a prime.

It is not a weakly prime, because it can be changed into another prime (215216513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107606256 + 107606257.

It is an arithmetic number, because the mean of its divisors is an integer number (107606257).

Almost surely, 2^215212513 is an apocalyptic number.

It is an amenable number.

215212513 is a deficient number, since it is larger than the sum of its proper divisors (1).

215212513 is an equidigital number, since it uses as much as digits as its factorization.

215212513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 600, while the sum is 22.

The square root of 215212513 is about 14670.1231419508. The cubic root of 215212513 is about 599.2699574605.

Subtracting 215212513 from its reverse (315212512), we obtain a palindrome (99999999).

The spelling of 215212513 in words is "two hundred fifteen million, two hundred twelve thousand, five hundred thirteen".