1225999 has 2 divisors, whose sum is σ = 1226000. Its totient is φ = 1225998.

The previous prime is 1225997. The next prime is 1226011. The reversal of 1225999 is 9995221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1225999 - 2¹ = 1225997 is a prime.

Together with 1225997, it forms a pair of twin primes.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612999 + 613000.

It is an arithmetic number, because the mean of its divisors is an integer number (613000).

2^1225999 is an apocalyptic number.

1225999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225999 is an equidigital number, since it uses as much as digits as its factorization.

1225999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580, while the sum is 37.

The square root of 1225999 is about 1107.2483912835. The cubic root of 1225999 is about 107.0278263437.

The spelling of 1225999 in words is "one million, two hundred twenty-five thousand, nine hundred ninety-nine".