1223923551 has 16 divisors (see below), whose sum is σ = 1818835200. Its totient is φ = 727532928.

The previous prime is 1223923549. The next prime is 1223923573. The reversal of 1223923551 is 1553293221.

It is not a de Polignac number, because 1223923551 - 2¹ = 1223923549 is a prime.

It is a super-3 number, since 3×1223923551³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223923531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 630571 + ... + 632508.

It is an arithmetic number, because the mean of its divisors is an integer number (113677200).

Almost surely, 2^1223923551 is an apocalyptic number.

1223923551 is a deficient number, since it is larger than the sum of its proper divisors (594911649).

1223923551 is a wasteful number, since it uses less digits than its factorization.

1223923551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263118.

The product of its digits is 16200, while the sum is 33.

The square root of 1223923551 is about 34984.6187773999. The cubic root of 1223923551 is about 1069.6739773026.

The spelling of 1223923551 in words is "one billion, two hundred twenty-three million, nine hundred twenty-three thousand, five hundred fifty-one".