55511123 has 2 divisors, whose sum is σ = 55511124. Its totient is φ = 55511122.

The previous prime is 55511081. The next prime is 55511143. The reversal of 55511123 is 32111555.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55511123 - 2⁸ = 55510867 is a prime.

It is a super-2 number, since 2×55511123² = 6162969553442258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55511143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27755561 + 27755562.

It is an arithmetic number, because the mean of its divisors is an integer number (27755562).

Almost surely, 2^55511123 is an apocalyptic number.

55511123 is a deficient number, since it is larger than the sum of its proper divisors (1).

55511123 is an equidigital number, since it uses as much as digits as its factorization.

55511123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 750, while the sum is 23.

The square root of 55511123 is about 7450.5787023559. The cubic root of 55511123 is about 381.4696618946.

Adding to 55511123 its reverse (32111555), we get a palindrome (87622678).

The spelling of 55511123 in words is "fifty-five million, five hundred eleven thousand, one hundred twenty-three".