247249669 has 2 divisors, whose sum is σ = 247249670. Its totient is φ = 247249668.

The previous prime is 247249663. The next prime is 247249703. The reversal of 247249669 is 966942742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205492225 + 41757444 = 14335^2 + 6462^2 .

It is a cyclic number.

It is not a de Polignac number, because 247249669 - 2⁵ = 247249637 is a prime.

It is a super-2 number, since 2×247249669² = 122264797641219122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247249663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123624834 + 123624835.

It is an arithmetic number, because the mean of its divisors is an integer number (123624835).

Almost surely, 2^247249669 is an apocalyptic number.

It is an amenable number.

247249669 is a deficient number, since it is larger than the sum of its proper divisors (1).

247249669 is an equidigital number, since it uses as much as digits as its factorization.

247249669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 49.

The square root of 247249669 is about 15724.1746683252. The cubic root of 247249669 is about 627.6418679991.

The spelling of 247249669 in words is "two hundred forty-seven million, two hundred forty-nine thousand, six hundred sixty-nine".