249563669 has 2 divisors, whose sum is σ = 249563670. Its totient is φ = 249563668.

The previous prime is 249563663. The next prime is 249563681. The reversal of 249563669 is 966365942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172791025 + 76772644 = 13145^2 + 8762^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249563669 is a prime.

It is a super-2 number, since 2×249563669² = 124564049769483122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249563663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124781834 + 124781835.

It is an arithmetic number, because the mean of its divisors is an integer number (124781835).

Almost surely, 2^249563669 is an apocalyptic number.

It is an amenable number.

249563669 is a deficient number, since it is larger than the sum of its proper divisors (1).

249563669 is an equidigital number, since it uses as much as digits as its factorization.

249563669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2099520, while the sum is 50.

The square root of 249563669 is about 15797.5842773508. The cubic root of 249563669 is about 629.5938164485.

The spelling of 249563669 in words is "two hundred forty-nine million, five hundred sixty-three thousand, six hundred sixty-nine".