1254509909 has 2 divisors, whose sum is σ = 1254509910. Its totient is φ = 1254509908.

The previous prime is 1254509897. The next prime is 1254509911. The reversal of 1254509909 is 9099054521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1251602884 + 2907025 = 35378^2 + 1705^2 .

It is an emirp because it is prime and its reverse (9099054521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1254509909 is a prime.

It is a super-2 number, since 2×1254509909² = 3147590223558376562, which contains 22 as substring.

Together with 1254509911, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1254509909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1254509939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627254954 + 627254955.

It is an arithmetic number, because the mean of its divisors is an integer number (627254955).

Almost surely, 2^1254509909 is an apocalyptic number.

It is an amenable number.

1254509909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1254509909 is an equidigital number, since it uses as much as digits as its factorization.

1254509909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145800, while the sum is 44.

The square root of 1254509909 is about 35419.0613794324. The cubic root of 1254509909 is about 1078.5112973526.

The spelling of 1254509909 in words is "one billion, two hundred fifty-four million, five hundred nine thousand, nine hundred nine".