263651 has 2 divisors, whose sum is σ = 263652. Its totient is φ = 263650.

The previous prime is 263647. The next prime is 263657. The reversal of 263651 is 156362.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 263651 - 2² = 263647 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (263657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131825 + 131826.

It is an arithmetic number, because the mean of its divisors is an integer number (131826).

2²⁶³⁶⁵¹ is an apocalyptic number.

263651 is a deficient number, since it is larger than the sum of its proper divisors (1).

263651 is an equidigital number, since it uses as much as digits as its factorization.

263651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 23.

The square root of 263651 is about 513.4695706661. The cubic root of 263651 is about 64.1224057129.

The spelling of 263651 in words is "two hundred sixty-three thousand, six hundred fifty-one".