247215313 has 4 divisors (see below), whose sum is σ = 247246848. Its totient is φ = 247183780.

The previous prime is 247215271. The next prime is 247215317. The reversal of 247215313 is 313512742.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247215313 is a prime.

It is a super-2 number, since 2×247215313² = 122230821963375938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247215317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6120 + ... + 23062.

It is an arithmetic number, because the mean of its divisors is an integer number (61811712).

Almost surely, 2^247215313 is an apocalyptic number.

It is an amenable number.

247215313 is a deficient number, since it is larger than the sum of its proper divisors (31535).

247215313 is a wasteful number, since it uses less digits than its factorization.

247215313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31534.

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

The square root of 247215313 is about 15723.0821723986. The cubic root of 247215313 is about 627.6127958161.

The spelling of 247215313 in words is "two hundred forty-seven million, two hundred fifteen thousand, three hundred thirteen".