263928649 has 2 divisors, whose sum is σ = 263928650. Its totient is φ = 263928648.

The previous prime is 263928631. The next prime is 263928667. The reversal of 263928649 is 946829362.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (263928631) and next prime (263928667).

It can be written as a sum of positive squares in only one way, i.e., 233325625 + 30603024 = 15275^2 + 5532^2 .

It is a cyclic number.

It is not a de Polignac number, because 263928649 - 2¹³ = 263920457 is a prime.

It is not a weakly prime, because it can be changed into another prime (263628649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131964324 + 131964325.

It is an arithmetic number, because the mean of its divisors is an integer number (131964325).

Almost surely, 2^263928649 is an apocalyptic number.

It is an amenable number.

263928649 is a deficient number, since it is larger than the sum of its proper divisors (1).

263928649 is an equidigital number, since it uses as much as digits as its factorization.

263928649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 49.

The square root of 263928649 is about 16245.8809856529. The cubic root of 263928649 is about 641.4490676651.

The spelling of 263928649 in words is "two hundred sixty-three million, nine hundred twenty-eight thousand, six hundred forty-nine".