1263401536 has 14 divisors (see below), whose sum is σ = 2507062550. Its totient is φ = 631700736.

The previous prime is 1263401521. The next prime is 1263401543. The reversal of 1263401536 is 6351043621.

It can be written as a sum of positive squares in only one way, i.e., 1263375936 + 25600 = 35544^2 + 160^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1263401498 and 1263401507.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9870261 + ... + 9870388.

Almost surely, 2^1263401536 is an apocalyptic number.

1263401536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1263401536 is a deficient number, since it is larger than the sum of its proper divisors (1243661014).

1263401536 is an equidigital number, since it uses as much as digits as its factorization.

1263401536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19740661 (or 19740651 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 1263401536 is about 35544.3601152138. The cubic root of 1263401536 is about 1081.0533664236.

The spelling of 1263401536 in words is "one billion, two hundred sixty-three million, four hundred one thousand, five hundred thirty-six".