1263145647 has 4 divisors (see below), whose sum is σ = 1684194200. Its totient is φ = 842097096.

The previous prime is 1263145621. The next prime is 1263145649. The reversal of 1263145647 is 7465413621.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1263145647 - 2⁸ = 1263145391 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 (1263145649) 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, 210524272 + ... + 210524277.

It is an arithmetic number, because the mean of its divisors is an integer number (421048550).

Almost surely, 2^1263145647 is an apocalyptic number.

1263145647 is a deficient number, since it is larger than the sum of its proper divisors (421048553).

1263145647 is an equidigital number, since it uses as much as digits as its factorization.

1263145647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421048552.

The product of its digits is 120960, while the sum is 39.

The square root of 1263145647 is about 35540.7603604650. The cubic root of 1263145647 is about 1080.9803760783.

The spelling of 1263145647 in words is "one billion, two hundred sixty-three million, one hundred forty-five thousand, six hundred forty-seven".