263744945 has 4 divisors (see below), whose sum is σ = 316493940. Its totient is φ = 210995952.

The previous prime is 263744911. The next prime is 263744959. The reversal of 263744945 is 549447362.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 549447362 = 2 ⋅274723681.

It can be written as a sum of positive squares in 2 ways, for example, as 163123984 + 100620961 = 12772^2 + 10031^2 .

It is a cyclic number.

It is not a de Polignac number, because 263744945 - 2⁶ = 263744881 is a prime.

It is a super-2 number, since 2×263744945² = 139122792026106050, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 263744896 and 263744905.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 26374490 + ... + 26374499.

It is an arithmetic number, because the mean of its divisors is an integer number (79123485).

Almost surely, 2^263744945 is an apocalyptic number.

It is an amenable number.

263744945 is a deficient number, since it is larger than the sum of its proper divisors (52748995).

263744945 is an equidigital number, since it uses as much as digits as its factorization.

263744945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52748994.

The product of its digits is 725760, while the sum is 44.

The square root of 263744945 is about 16240.2261375881. The cubic root of 263744945 is about 641.3002091129.

The spelling of 263744945 in words is "two hundred sixty-three million, seven hundred forty-four thousand, nine hundred forty-five".