247904681 has 2 divisors, whose sum is σ = 247904682. Its totient is φ = 247904680.

The previous prime is 247904669. The next prime is 247904707. The reversal of 247904681 is 186409742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 246992656 + 912025 = 15716^2 + 955^2 .

It is a cyclic number.

It is not a de Polignac number, because 247904681 - 2¹⁰ = 247903657 is a prime.

It is a super-2 number, since 2×247904681² = 122913461723423522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (247904611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123952340 + 123952341.

It is an arithmetic number, because the mean of its divisors is an integer number (123952341).

Almost surely, 2^247904681 is an apocalyptic number.

It is an amenable number.

247904681 is a deficient number, since it is larger than the sum of its proper divisors (1).

247904681 is an equidigital number, since it uses as much as digits as its factorization.

247904681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 247904681 is about 15744.9890758933. The cubic root of 247904681 is about 628.1956273511.

The spelling of 247904681 in words is "two hundred forty-seven million, nine hundred four thousand, six hundred eighty-one".