1248727473509 has 4 divisors (see below), whose sum is σ = 1248731166816. Its totient is φ = 1248723780204.

The previous prime is 1248727473491. The next prime is 1248727473541. The reversal of 1248727473509 is 9053747278421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1248727473509 - 2¹² = 1248727469413 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 (1248727413509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1281929 + ... + 2034894.

It is an arithmetic number, because the mean of its divisors is an integer number (312182791704).

Almost surely, 2^{1248727473509} is an apocalyptic number.

It is an amenable number.

1248727473509 is a deficient number, since it is larger than the sum of its proper divisors (3693307).

1248727473509 is an equidigital number, since it uses as much as digits as its factorization.

1248727473509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3693306.

The product of its (nonzero) digits is 23708160, while the sum is 59.

The spelling of 1248727473509 in words is "one trillion, two hundred forty-eight billion, seven hundred twenty-seven million, four hundred seventy-three thousand, five hundred nine".