1225663 has 2 divisors, whose sum is σ = 1225664. Its totient is φ = 1225662.

The previous prime is 1225657. The next prime is 1225687. The reversal of 1225663 is 3665221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1225663 - 2¹³ = 1217471 is a prime.

It is a congruent number.

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, 612831 + 612832.

It is an arithmetic number, because the mean of its divisors is an integer number (612832).

2^1225663 is an apocalyptic number.

1225663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225663 is an equidigital number, since it uses as much as digits as its factorization.

1225663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 25.

The square root of 1225663 is about 1107.0966534138. The cubic root of 1225663 is about 107.0180480227.

It can be divided in two parts, 1225 and 663, that multiplied together give a triangular number (812175 = T₁₂₇₄).

The spelling of 1225663 in words is "one million, two hundred twenty-five thousand, six hundred sixty-three".