1248642909 has 6 divisors (see below), whose sum is σ = 1803595326. Its totient is φ = 832428600.

The previous prime is 1248642869. The next prime is 1248642943. The reversal of 1248642909 is 9092468421.

It can be written as a sum of positive squares in only one way, i.e., 1167588900 + 81054009 = 34170^2 + 9003^2 .

It is not a de Polignac number, because 1248642909 - 2⁷ = 1248642781 is a prime.

It is a super-2 number, since 2×1248642909² = 3118218228391964562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1248642949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69369042 + ... + 69369059.

It is an arithmetic number, because the mean of its divisors is an integer number (300599221).

Almost surely, 2^1248642909 is an apocalyptic number.

It is an amenable number.

1248642909 is a deficient number, since it is larger than the sum of its proper divisors (554952417).

1248642909 is a wasteful number, since it uses less digits than its factorization.

1248642909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138738107 (or 138738104 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 1248642909 is about 35336.1416824191. The cubic root of 1248642909 is about 1076.8273686626.

The spelling of 1248642909 in words is "one billion, two hundred forty-eight million, six hundred forty-two thousand, nine hundred nine".