1225919 has 2 divisors, whose sum is σ = 1225920. Its totient is φ = 1225918.

The previous prime is 1225909. The next prime is 1225927. The reversal of 1225919 is 9195221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1225919 - 2⁸ = 1225663 is a prime.

It is a super-2 number, since 2×1225919² = 3005754789122, which contains 22 as substring.

It is equal to p₉₄₇₆₃ and since 1225919 and 94763 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 1225891 and 1225900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612959 + 612960.

It is an arithmetic number, because the mean of its divisors is an integer number (612960).

2^1225919 is an apocalyptic number.

1225919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225919 is an equidigital number, since it uses as much as digits as its factorization.

1225919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 29.

The square root of 1225919 is about 1107.2122651055. The cubic root of 1225919 is about 107.0254983341.

The spelling of 1225919 in words is "one million, two hundred twenty-five thousand, nine hundred nineteen".