1225123519 has 2 divisors, whose sum is σ = 1225123520. Its totient is φ = 1225123518.

The previous prime is 1225123511. The next prime is 1225123579. The reversal of 1225123519 is 9153215221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1225123519 - 2³ = 1225123511 is a prime.

It is a super-2 number, since 2×1225123519² = 3001855273613886722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225123511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612561759 + 612561760.

It is an arithmetic number, because the mean of its divisors is an integer number (612561760).

Almost surely, 2^1225123519 is an apocalyptic number.

1225123519 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225123519 is an equidigital number, since it uses as much as digits as its factorization.

1225123519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 31.

The square root of 1225123519 is about 35001.7645126642. The cubic root of 1225123519 is about 1070.0234422907.

The spelling of 1225123519 in words is "one billion, two hundred twenty-five million, one hundred twenty-three thousand, five hundred nineteen".