1225252009 has 2 divisors, whose sum is σ = 1225252010. Its totient is φ = 1225252008.

The previous prime is 1225251991. The next prime is 1225252013. The reversal of 1225252009 is 9002525221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1049954409 + 175297600 = 32403^2 + 13240^2 .

It is an emirp because it is prime and its reverse (9002525221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1225252009 - 2¹⁷ = 1225120937 is a prime.

It is not a weakly prime, because it can be changed into another prime (1225252309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612626004 + 612626005.

It is an arithmetic number, because the mean of its divisors is an integer number (612626005).

Almost surely, 2^1225252009 is an apocalyptic number.

It is an amenable number.

1225252009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225252009 is an equidigital number, since it uses as much as digits as its factorization.

1225252009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1225252009 is about 35003.5999434344. The cubic root of 1225252009 is about 1070.0608487246.

It can be divided in two parts, 12252 and 52009, that added together give a triangular number (64261 = T₃₅₈).

The spelling of 1225252009 in words is "one billion, two hundred twenty-five million, two hundred fifty-two thousand, nine".