1263539 has 2 divisors, whose sum is σ = 1263540. Its totient is φ = 1263538.

The previous prime is 1263511. The next prime is 1263541. The reversal of 1263539 is 9353621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1263539 is a prime.

Together with 1263541, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1263569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631769 + 631770.

It is an arithmetic number, because the mean of its divisors is an integer number (631770).

2^1263539 is an apocalyptic number.

1263539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263539 is an equidigital number, since it uses as much as digits as its factorization.

1263539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860, while the sum is 29.

The square root of 1263539 is about 1124.0725065582. The cubic root of 1263539 is about 108.1092572890.

The spelling of 1263539 in words is "one million, two hundred sixty-three thousand, five hundred thirty-nine".