1223235551 has 2 divisors, whose sum is σ = 1223235552. Its totient is φ = 1223235550.

The previous prime is 1223235547. The next prime is 1223235571. The reversal of 1223235551 is 1555323221.

It is a weak prime.

It is an emirp because it is prime and its reverse (1555323221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1223235551 - 2² = 1223235547 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223235571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611617775 + 611617776.

It is an arithmetic number, because the mean of its divisors is an integer number (611617776).

Almost surely, 2^1223235551 is an apocalyptic number.

1223235551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223235551 is an equidigital number, since it uses as much as digits as its factorization.

1223235551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9000, while the sum is 29.

The square root of 1223235551 is about 34974.7845025527. The cubic root of 1223235551 is about 1069.4735089985.

Adding to 1223235551 its reverse (1555323221), we get a palindrome (2778558772).

The spelling of 1223235551 in words is "one billion, two hundred twenty-three million, two hundred thirty-five thousand, five hundred fifty-one".