1220123449 has 2 divisors, whose sum is σ = 1220123450. Its totient is φ = 1220123448.

The previous prime is 1220123381. The next prime is 1220123453. The reversal of 1220123449 is 9443210221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1199375424 + 20748025 = 34632^2 + 4555^2 .

It is an emirp because it is prime and its reverse (9443210221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220123449 - 2¹¹ = 1220121401 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220123549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610061724 + 610061725.

It is an arithmetic number, because the mean of its divisors is an integer number (610061725).

Almost surely, 2^1220123449 is an apocalyptic number.

It is an amenable number.

1220123449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220123449 is an equidigital number, since it uses as much as digits as its factorization.

1220123449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1220123449 is about 34930.2655157386. The cubic root of 1220123449 is about 1068.5657696237.

The spelling of 1220123449 in words is "one billion, two hundred twenty million, one hundred twenty-three thousand, four hundred forty-nine".