1225643 has 2 divisors, whose sum is σ = 1225644. Its totient is φ = 1225642.

The previous prime is 1225621. The next prime is 1225657. The reversal of 1225643 is 3465221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1225643 - 2⁶ = 1225579 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1225603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612821 + 612822.

It is an arithmetic number, because the mean of its divisors is an integer number (612822).

2^1225643 is an apocalyptic number.

1225643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225643 is an equidigital number, since it uses as much as digits as its factorization.

1225643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 23.

The square root of 1225643 is about 1107.0876207419. The cubic root of 1225643 is about 107.0174659234.

The spelling of 1225643 in words is "one million, two hundred twenty-five thousand, six hundred forty-three".