263479481 has 4 divisors (see below), whose sum is σ = 278978292. Its totient is φ = 247980672.

The previous prime is 263479477. The next prime is 263479493. The reversal of 263479481 is 184974362.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 184974362 = 2 ⋅92487181.

It can be written as a sum of positive squares in 2 ways, for example, as 152893225 + 110586256 = 12365^2 + 10516^2 .

It is a cyclic number.

It is not a de Polignac number, because 263479481 - 2² = 263479477 is a prime.

It is a super-2 number, since 2×263479481² = 138842873816058722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263479081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7749380 + ... + 7749413.

It is an arithmetic number, because the mean of its divisors is an integer number (69744573).

Almost surely, 2^263479481 is an apocalyptic number.

It is an amenable number.

263479481 is a deficient number, since it is larger than the sum of its proper divisors (15498811).

263479481 is a wasteful number, since it uses less digits than its factorization.

263479481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15498810.

The product of its digits is 290304, while the sum is 44.

The square root of 263479481 is about 16232.0510410730. The cubic root of 263479481 is about 641.0849768451.

The spelling of 263479481 in words is "two hundred sixty-three million, four hundred seventy-nine thousand, four hundred eighty-one".