247688893 has 2 divisors, whose sum is σ = 247688894. Its totient is φ = 247688892.

The previous prime is 247688887. The next prime is 247688897. The reversal of 247688893 is 398886742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 247527289 + 161604 = 15733^2 + 402^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247688893 is a prime.

It is a super-2 number, since 2×247688893² = 122699575431130898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247688897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123844446 + 123844447.

It is an arithmetic number, because the mean of its divisors is an integer number (123844447).

Almost surely, 2^247688893 is an apocalyptic number.

It is an amenable number.

247688893 is a deficient number, since it is larger than the sum of its proper divisors (1).

247688893 is an equidigital number, since it uses as much as digits as its factorization.

247688893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4644864, while the sum is 55.

The square root of 247688893 is about 15738.1349911608. The cubic root of 247688893 is about 628.0133040104.

The spelling of 247688893 in words is "two hundred forty-seven million, six hundred eighty-eight thousand, eight hundred ninety-three".