1248161909 has 2 divisors, whose sum is σ = 1248161910. Its totient is φ = 1248161908.

The previous prime is 1248161857. The next prime is 1248161911. The reversal of 1248161909 is 9091618421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1122049009 + 126112900 = 33497^2 + 11230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1248161909 is a prime.

Together with 1248161911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1248161609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624080954 + 624080955.

It is an arithmetic number, because the mean of its divisors is an integer number (624080955).

Almost surely, 2^1248161909 is an apocalyptic number.

It is an amenable number.

1248161909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1248161909 is an equidigital number, since it uses as much as digits as its factorization.

1248161909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 1248161909 is about 35329.3349640210. The cubic root of 1248161909 is about 1076.6890797295.

The spelling of 1248161909 in words is "one billion, two hundred forty-eight million, one hundred sixty-one thousand, nine hundred nine".