1263437345 has 24 divisors (see below), whose sum is σ = 1610151480. Its totient is φ = 950028800.

The previous prime is 1263437341. The next prime is 1263437347. The reversal of 1263437345 is 5437343621.

It can be written as a sum of positive squares in 12 ways, for example, as 796142656 + 467294689 = 28216^2 + 21617^2 .

It is not a de Polignac number, because 1263437345 - 2² = 1263437341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1263437299 and 1263437308.

It is not an unprimeable number, because it can be changed into a prime (1263437341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2740415 + ... + 2740875.

It is an arithmetic number, because the mean of its divisors is an integer number (67089645).

Almost surely, 2^1263437345 is an apocalyptic number.

It is an amenable number.

1263437345 is a deficient number, since it is larger than the sum of its proper divisors (346714135).

1263437345 is an frugal number, since it uses more digits than its factorization.

1263437345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997 (or 536 counting only the distinct ones).

The product of its digits is 181440, while the sum is 38.

The square root of 1263437345 is about 35544.8638343151. The cubic root of 1263437345 is about 1081.0635798759.

The spelling of 1263437345 in words is "one billion, two hundred sixty-three million, four hundred thirty-seven thousand, three hundred forty-five".