1553111123 has 2 divisors, whose sum is σ = 1553111124. Its totient is φ = 1553111122.

The previous prime is 1553111113. The next prime is 1553111171. The reversal of 1553111123 is 3211113551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1553111123 - 2¹⁰ = 1553110099 is a prime.

It is a super-2 number, since 2×1553111123² = 4824308320772642258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1553111113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776555561 + 776555562.

It is an arithmetic number, because the mean of its divisors is an integer number (776555562).

Almost surely, 2^1553111123 is an apocalyptic number.

1553111123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1553111123 is an equidigital number, since it uses as much as digits as its factorization.

1553111123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 450, while the sum is 23.

The square root of 1553111123 is about 39409.5308650078. The cubic root of 1553111123 is about 1158.0683077722.

Adding to 1553111123 its reverse (3211113551), we get a palindrome (4764224674).

The spelling of 1553111123 in words is "one billion, five hundred fifty-three million, one hundred eleven thousand, one hundred twenty-three".