247348891 has 2 divisors, whose sum is σ = 247348892. Its totient is φ = 247348890.

The previous prime is 247348847. The next prime is 247348903. The reversal of 247348891 is 198843742.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 247348891 - 2⁹ = 247348379 is a prime.

It is a super-2 number, since 2×247348891² = 122362947757859762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (247348991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123674445 + 123674446.

It is an arithmetic number, because the mean of its divisors is an integer number (123674446).

Almost surely, 2^247348891 is an apocalyptic number.

247348891 is a deficient number, since it is larger than the sum of its proper divisors (1).

247348891 is an equidigital number, since it uses as much as digits as its factorization.

247348891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 46.

The square root of 247348891 is about 15727.3294300081. The cubic root of 247348891 is about 627.7258149302.

The spelling of 247348891 in words is "two hundred forty-seven million, three hundred forty-eight thousand, eight hundred ninety-one".