1263540359 has 4 divisors (see below), whose sum is σ = 1263647640. Its totient is φ = 1263433080.

The previous prime is 1263540319. The next prime is 1263540361. The reversal of 1263540359 is 9530453621.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9530453621 = 13 ⋅733111817.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1263540359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263540319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33437 + ... + 60374.

It is an arithmetic number, because the mean of its divisors is an integer number (315911910).

Almost surely, 2^1263540359 is an apocalyptic number.

1263540359 is a deficient number, since it is larger than the sum of its proper divisors (107281).

1263540359 is an equidigital number, since it uses as much as digits as its factorization.

1263540359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107280.

The product of its (nonzero) digits is 97200, while the sum is 38.

The square root of 1263540359 is about 35546.3128748960. The cubic root of 1263540359 is about 1081.0929604800.

The spelling of 1263540359 in words is "one billion, two hundred sixty-three million, five hundred forty thousand, three hundred fifty-nine".