1245387263 has 4 divisors (see below), whose sum is σ = 1254894168. Its totient is φ = 1235880360.

The previous prime is 1245387203. The next prime is 1245387277. The reversal of 1245387263 is 3627835421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3627835421 = 7 ⋅518262203.

It is a cyclic number.

It is not a de Polignac number, because 1245387263 - 2¹⁰ = 1245386239 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1245387263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245387203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4753256 + ... + 4753517.

It is an arithmetic number, because the mean of its divisors is an integer number (313723542).

Almost surely, 2^1245387263 is an apocalyptic number.

1245387263 is a deficient number, since it is larger than the sum of its proper divisors (9506905).

1245387263 is an equidigital number, since it uses as much as digits as its factorization.

1245387263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9506904.

The product of its digits is 241920, while the sum is 41.

The square root of 1245387263 is about 35290.0448143666. The cubic root of 1245387263 is about 1075.8906663621.

The spelling of 1245387263 in words is "one billion, two hundred forty-five million, three hundred eighty-seven thousand, two hundred sixty-three".