247279031 has 2 divisors, whose sum is σ = 247279032. Its totient is φ = 247279030.

The previous prime is 247278953. The next prime is 247279051. The reversal of 247279031 is 130972742.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 247279031 - 2²⁶ = 180170167 is a prime.

It is a super-2 number, since 2×247279031² = 122293838344597922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 247278982 and 247279000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247279051) 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, 123639515 + 123639516.

It is an arithmetic number, because the mean of its divisors is an integer number (123639516).

Almost surely, 2^247279031 is an apocalyptic number.

247279031 is a deficient number, since it is larger than the sum of its proper divisors (1).

247279031 is an equidigital number, since it uses as much as digits as its factorization.

247279031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 247279031 is about 15725.1082985142. The cubic root of 247279031 is about 627.6667121053. Note that the first 3 decimals are identical.

The spelling of 247279031 in words is "two hundred forty-seven million, two hundred seventy-nine thousand, thirty-one".