263971 has 6 divisors (see below), whose sum is σ = 276500. Its totient is φ = 251988.

The previous prime is 263957. The next prime is 263983. The reversal of 263971 is 179362.

263971 = T₄₁₈ + T₄₁₉ + T₄₂₀.

It is not a de Polignac number, because 263971 - 2⁷ = 263843 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (263911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 280 + ... + 778.

2²⁶³⁹⁷¹ is an apocalyptic number.

263971 is the 420-th centered triangular number.

263971 is a deficient number, since it is larger than the sum of its proper divisors (12529).

263971 is an equidigital number, since it uses as much as digits as its factorization.

263971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545 (or 522 counting only the distinct ones).

The product of its digits is 2268, while the sum is 28.

The square root of 263971 is about 513.7810817848. The cubic root of 263971 is about 64.1483375620.

The spelling of 263971 in words is "two hundred sixty-three thousand, nine hundred seventy-one".