247971461 has 2 divisors, whose sum is σ = 247971462. Its totient is φ = 247971460.

The previous prime is 247971421. The next prime is 247971473. The reversal of 247971461 is 164179742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245392225 + 2579236 = 15665^2 + 1606^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247971461 is a prime.

It is a super-3 number, since 3×247971461³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247971421) 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, 123985730 + 123985731.

It is an arithmetic number, because the mean of its divisors is an integer number (123985731).

Almost surely, 2^247971461 is an apocalyptic number.

It is an amenable number.

247971461 is a deficient number, since it is larger than the sum of its proper divisors (1).

247971461 is an equidigital number, since it uses as much as digits as its factorization.

247971461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 247971461 is about 15747.1096077979. The cubic root of 247971461 is about 628.2520295908.

The spelling of 247971461 in words is "two hundred forty-seven million, nine hundred seventy-one thousand, four hundred sixty-one".