247278231 has 16 divisors (see below), whose sum is σ = 373252320. Its totient is φ = 161740800.

The previous prime is 247278211. The next prime is 247278281. The reversal of 247278231 is 132872742.

It is not a de Polignac number, because 247278231 - 2¹⁸ = 247016087 is a prime.

It is a super-2 number, since 2×247278231² = 122293047052978722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247278211) 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 in 15 ways as a sum of consecutive naturals, for example, 84970 + ... + 87831.

It is an arithmetic number, because the mean of its divisors is an integer number (23328270).

Almost surely, 2^247278231 is an apocalyptic number.

247278231 is a deficient number, since it is larger than the sum of its proper divisors (125974089).

247278231 is a wasteful number, since it uses less digits than its factorization.

247278231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172863 (or 172857 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 247278231 is about 15725.0828614669. The cubic root of 247278231 is about 627.6660352263. Note that the first 3 decimals are identical.

The spelling of 247278231 in words is "two hundred forty-seven million, two hundred seventy-eight thousand, two hundred thirty-one".