263155649 has 2 divisors, whose sum is σ = 263155650. Its totient is φ = 263155648.

The previous prime is 263155639. The next prime is 263155661. The reversal of 263155649 is 946551362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225210049 + 37945600 = 15007^2 + 6160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263155649 is a prime.

It is a super-2 number, since 2×263155649² = 138501791201222402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (263155609) 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, 131577824 + 131577825.

It is an arithmetic number, because the mean of its divisors is an integer number (131577825).

Almost surely, 2^263155649 is an apocalyptic number.

It is an amenable number.

263155649 is a deficient number, since it is larger than the sum of its proper divisors (1).

263155649 is an equidigital number, since it uses as much as digits as its factorization.

263155649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 41.

The square root of 263155649 is about 16222.0728946704. The cubic root of 263155649 is about 640.8222252764.

The spelling of 263155649 in words is "two hundred sixty-three million, one hundred fifty-five thousand, six hundred forty-nine".