1225892609 has 2 divisors, whose sum is σ = 1225892610. Its totient is φ = 1225892608.

The previous prime is 1225892557. The next prime is 1225892623. The reversal of 1225892609 is 9062985221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 822083584 + 403809025 = 28672^2 + 20095^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225892609 - 2¹⁶ = 1225827073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1225892609.

It is not a weakly prime, because it can be changed into another prime (1225892659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612946304 + 612946305.

It is an arithmetic number, because the mean of its divisors is an integer number (612946305).

Almost surely, 2^1225892609 is an apocalyptic number.

It is an amenable number.

1225892609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225892609 is an equidigital number, since it uses as much as digits as its factorization.

1225892609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 1225892609 is about 35012.7492351001. The cubic root of 1225892609 is about 1070.2473033059.

The spelling of 1225892609 in words is "one billion, two hundred twenty-five million, eight hundred ninety-two thousand, six hundred nine".