1213455623 has 2 divisors, whose sum is σ = 1213455624. Its totient is φ = 1213455622.

The previous prime is 1213455611. The next prime is 1213455629. The reversal of 1213455623 is 3265543121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1213455623 - 2²⁰ = 1212407047 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1213455623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213455629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606727811 + 606727812.

It is an arithmetic number, because the mean of its divisors is an integer number (606727812).

Almost surely, 2^1213455623 is an apocalyptic number.

1213455623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213455623 is an equidigital number, since it uses as much as digits as its factorization.

1213455623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 32.

The square root of 1213455623 is about 34834.6899369005. The cubic root of 1213455623 is about 1066.6156857253.

Adding to 1213455623 its reverse (3265543121), we get a palindrome (4478998744).

The spelling of 1213455623 in words is "one billion, two hundred thirteen million, four hundred fifty-five thousand, six hundred twenty-three".