1249159909 has 2 divisors, whose sum is σ = 1249159910. Its totient is φ = 1249159908.

The previous prime is 1249159853. The next prime is 1249159939. The reversal of 1249159909 is 9099519421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 792141025 + 457018884 = 28145^2 + 21378^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1249159909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1249159939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624579954 + 624579955.

It is an arithmetic number, because the mean of its divisors is an integer number (624579955).

Almost surely, 2^1249159909 is an apocalyptic number.

It is an amenable number.

1249159909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249159909 is an equidigital number, since it uses as much as digits as its factorization.

1249159909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 49.

The square root of 1249159909 is about 35343.4563816274. The cubic root of 1249159909 is about 1076.9759681078.

The spelling of 1249159909 in words is "one billion, two hundred forty-nine million, one hundred fifty-nine thousand, nine hundred nine".