1225342409 has 2 divisors, whose sum is σ = 1225342410. Its totient is φ = 1225342408.

The previous prime is 1225342381. The next prime is 1225342451. The reversal of 1225342409 is 9042435221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 990486784 + 234855625 = 31472^2 + 15325^2 .

It is an emirp because it is prime and its reverse (9042435221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1225342409 - 2²⁸ = 956906953 is a prime.

It is not a weakly prime, because it can be changed into another prime (1225342309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612671204 + 612671205.

It is an arithmetic number, because the mean of its divisors is an integer number (612671205).

Almost surely, 2^1225342409 is an apocalyptic number.

It is an amenable number.

1225342409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225342409 is an equidigital number, since it uses as much as digits as its factorization.

1225342409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 1225342409 is about 35004.8912153716. The cubic root of 1225342409 is about 1070.0871647046.

The spelling of 1225342409 in words is "one billion, two hundred twenty-five million, three hundred forty-two thousand, four hundred nine".