247887391 has 2 divisors, whose sum is σ = 247887392. Its totient is φ = 247887390.

The previous prime is 247887359. The next prime is 247887403. The reversal of 247887391 is 193788742.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 247887391 - 2⁵ = 247887359 is a prime.

It is a super-2 number, since 2×247887391² = 122896317233573762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247887301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123943695 + 123943696.

It is an arithmetic number, because the mean of its divisors is an integer number (123943696).

Almost surely, 2^247887391 is an apocalyptic number.

247887391 is a deficient number, since it is larger than the sum of its proper divisors (1).

247887391 is an equidigital number, since it uses as much as digits as its factorization.

247887391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 49.

The square root of 247887391 is about 15744.4400027438. The cubic root of 247887391 is about 628.1810226048.

The spelling of 247887391 in words is "two hundred forty-seven million, eight hundred eighty-seven thousand, three hundred ninety-one".