55123011 has 10 divisors (see below), whose sum is σ = 82344372. Its totient is φ = 36748620.

The previous prime is 55123001. The next prime is 55123037. The reversal of 55123011 is 11032155.

It is not a de Polignac number, because 55123011 - 2⁵ = 55122979 is a prime.

It is a super-2 number, since 2×55123011² = 6077092683412242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55123001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 340185 + ... + 340346.

Almost surely, 2^55123011 is an apocalyptic number.

55123011 is a deficient number, since it is larger than the sum of its proper divisors (27221361).

55123011 is an equidigital number, since it uses as much as digits as its factorization.

55123011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680543 (or 680534 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 55123011 is about 7424.4872550231. The cubic root of 55123011 is about 380.5785531424.

Adding to 55123011 its reverse (11032155), we get a palindrome (66155166).

The spelling of 55123011 in words is "fifty-five million, one hundred twenty-three thousand, eleven".