1223965553 has 2 divisors, whose sum is σ = 1223965554. Its totient is φ = 1223965552.

The previous prime is 1223965487. The next prime is 1223965577. The reversal of 1223965553 is 3555693221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1212989584 + 10975969 = 34828^2 + 3313^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223965553 - 2¹⁴ = 1223949169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1223965553.

It is not a weakly prime, because it can be changed into another prime (1223965153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611982776 + 611982777.

It is an arithmetic number, because the mean of its divisors is an integer number (611982777).

Almost surely, 2^1223965553 is an apocalyptic number.

It is an amenable number.

1223965553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223965553 is an equidigital number, since it uses as much as digits as its factorization.

1223965553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 243000, while the sum is 41.

The square root of 1223965553 is about 34985.2190646279. The cubic root of 1223965553 is about 1069.6862133426.

The spelling of 1223965553 in words is "one billion, two hundred twenty-three million, nine hundred sixty-five thousand, five hundred fifty-three".