1225021379 has 2 divisors, whose sum is σ = 1225021380. Its totient is φ = 1225021378.

The previous prime is 1225021351. The next prime is 1225021381. The reversal of 1225021379 is 9731205221.

It is a strong prime.

It is an emirp because it is prime and its reverse (9731205221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1225021379 - 2²⁰ = 1223972803 is a prime.

Together with 1225021381, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1225021349) 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, 612510689 + 612510690.

It is an arithmetic number, because the mean of its divisors is an integer number (612510690).

Almost surely, 2^1225021379 is an apocalyptic number.

1225021379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225021379 is an equidigital number, since it uses as much as digits as its factorization.

1225021379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 1225021379 is about 35000.3054129532. The cubic root of 1225021379 is about 1069.9937050901.

The spelling of 1225021379 in words is "one billion, two hundred twenty-five million, twenty-one thousand, three hundred seventy-nine".