247213513 has 2 divisors, whose sum is σ = 247213514. Its totient is φ = 247213512.

The previous prime is 247213511. The next prime is 247213523. The reversal of 247213513 is 315312742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 247212729 + 784 = 15723^2 + 28^2 .

It is a cyclic number.

It is not a de Polignac number, because 247213513 - 2¹ = 247213511 is a prime.

It is a super-2 number, since 2×247213513² = 122229042019602338, which contains 22 as substring.

Together with 247213511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (247213511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123606756 + 123606757.

It is an arithmetic number, because the mean of its divisors is an integer number (123606757).

Almost surely, 2^247213513 is an apocalyptic number.

It is an amenable number.

247213513 is a deficient number, since it is larger than the sum of its proper divisors (1).

247213513 is an equidigital number, since it uses as much as digits as its factorization.

247213513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 28.

The square root of 247213513 is about 15723.0249316091. The cubic root of 247213513 is about 627.6112725748.

The spelling of 247213513 in words is "two hundred forty-seven million, two hundred thirteen thousand, five hundred thirteen".