247981093 has 2 divisors, whose sum is σ = 247981094. Its totient is φ = 247981092.

The previous prime is 247981087. The next prime is 247981157. The reversal of 247981093 is 390189742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181117764 + 66863329 = 13458^2 + 8177^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247981093 is a prime.

It is a super-2 number, since 2×247981093² = 122989244970949298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247981033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123990546 + 123990547.

It is an arithmetic number, because the mean of its divisors is an integer number (123990547).

Almost surely, 2^247981093 is an apocalyptic number.

It is an amenable number.

247981093 is a deficient number, since it is larger than the sum of its proper divisors (1).

247981093 is an equidigital number, since it uses as much as digits as its factorization.

247981093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 247981093 is about 15747.4154387315. The cubic root of 247981093 is about 628.2601639209.

The spelling of 247981093 in words is "two hundred forty-seven million, nine hundred eighty-one thousand, ninety-three".