263961 has 12 divisors (see below), whose sum is σ = 385840. Its totient is φ = 173880.

The previous prime is 263957. The next prime is 263983. The reversal of 263961 is 169362.

It is a happy number.

It is not a de Polignac number, because 263961 - 2² = 263957 is a prime.

It is a Duffinian number.

263961 is a lucky number.

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 11 ways as a sum of consecutive naturals, for example, 1146 + ... + 1356.

2²⁶³⁹⁶¹ is an apocalyptic number.

It is an amenable number.

263961 is a deficient number, since it is larger than the sum of its proper divisors (121879).

263961 is a wasteful number, since it uses less digits than its factorization.

263961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356 (or 353 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 263961 is about 513.7713499213. The cubic root of 263961 is about 64.1475275090.

The spelling of 263961 in words is "two hundred sixty-three thousand, nine hundred sixty-one".