247941643 has 2 divisors, whose sum is σ = 247941644. Its totient is φ = 247941642.

The previous prime is 247941613. The next prime is 247941647. The reversal of 247941643 is 346149742.

247941643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 247941643 - 2²¹ = 245844491 is a prime.

It is a super-2 number, since 2×247941643² = 122950116667078898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 247941596 and 247941605.

It is not a weakly prime, because it can be changed into another prime (247941647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123970821 + 123970822.

It is an arithmetic number, because the mean of its divisors is an integer number (123970822).

Almost surely, 2^247941643 is an apocalyptic number.

247941643 is a deficient number, since it is larger than the sum of its proper divisors (1).

247941643 is an equidigital number, since it uses as much as digits as its factorization.

247941643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 40.

The square root of 247941643 is about 15746.1628024100. The cubic root of 247941643 is about 628.2268466257.

The spelling of 247941643 in words is "two hundred forty-seven million, nine hundred forty-one thousand, six hundred forty-three".