213748612613 has 2 divisors, whose sum is σ = 213748612614. Its totient is φ = 213748612612.

The previous prime is 213748612607. The next prime is 213748612631. The reversal of 213748612613 is 316216847312.

It is a happy number.

Together with next prime (213748612631) 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., 139362595969 + 74386016644 = 373313^2 + 272738^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213748612613 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213748612663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106874306306 + 106874306307.

It is an arithmetic number, because the mean of its divisors is an integer number (106874306307).

Almost surely, 2^213748612613 is an apocalyptic number.

It is an amenable number.

213748612613 is a deficient number, since it is larger than the sum of its proper divisors (1).

213748612613 is an equidigital number, since it uses as much as digits as its factorization.

213748612613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 44.

The spelling of 213748612613 in words is "two hundred thirteen billion, seven hundred forty-eight million, six hundred twelve thousand, six hundred thirteen".