1225421189 has 2 divisors, whose sum is σ = 1225421190. Its totient is φ = 1225421188.

The previous prime is 1225421159. The next prime is 1225421191. The reversal of 1225421189 is 9811245221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 915062500 + 310358689 = 30250^2 + 17617^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225421189 - 2²⁰ = 1224372613 is a prime.

It is a super-3 number, since 3×1225421189³ (a number of 28 digits) contains 333 as substring.

Together with 1225421191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225421159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612710594 + 612710595.

It is an arithmetic number, because the mean of its divisors is an integer number (612710595).

Almost surely, 2^1225421189 is an apocalyptic number.

It is an amenable number.

1225421189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225421189 is an equidigital number, since it uses as much as digits as its factorization.

1225421189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 35.

The square root of 1225421189 is about 35006.0164686015. The cubic root of 1225421189 is about 1070.1100969777.

The spelling of 1225421189 in words is "one billion, two hundred twenty-five million, four hundred twenty-one thousand, one hundred eighty-nine".