263378257 has 2 divisors, whose sum is σ = 263378258. Its totient is φ = 263378256.

The previous prime is 263378249. The next prime is 263378279. The reversal of 263378257 is 752873362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231070401 + 32307856 = 15201^2 + 5684^2 .

It is a cyclic number.

It is not a de Polignac number, because 263378257 - 2³ = 263378249 is a prime.

It is not a weakly prime, because it can be changed into another prime (263178257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131689128 + 131689129.

It is an arithmetic number, because the mean of its divisors is an integer number (131689129).

Almost surely, 2^263378257 is an apocalyptic number.

It is an amenable number.

263378257 is a deficient number, since it is larger than the sum of its proper divisors (1).

263378257 is an equidigital number, since it uses as much as digits as its factorization.

263378257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 43.

The square root of 263378257 is about 16228.9327129051. The cubic root of 263378257 is about 641.0028686198.

The spelling of 263378257 in words is "two hundred sixty-three million, three hundred seventy-eight thousand, two hundred fifty-seven".