247235231 has 2 divisors, whose sum is σ = 247235232. Its totient is φ = 247235230.

The previous prime is 247235227. The next prime is 247235297. The reversal of 247235231 is 132532742.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 247235231 - 2² = 247235227 is a prime.

It is a super-2 number, since 2×247235231² = 122250518895246722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 247235194 and 247235203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247235431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123617615 + 123617616.

It is an arithmetic number, because the mean of its divisors is an integer number (123617616).

Almost surely, 2^247235231 is an apocalyptic number.

247235231 is a deficient number, since it is larger than the sum of its proper divisors (1).

247235231 is an equidigital number, since it uses as much as digits as its factorization.

247235231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 29.

The square root of 247235231 is about 15723.7155596252. The cubic root of 247235231 is about 627.6296508345.

Adding to 247235231 its reverse (132532742), we get a palindrome (379767973).

The spelling of 247235231 in words is "two hundred forty-seven million, two hundred thirty-five thousand, two hundred thirty-one".