55123123531 has 16 divisors (see below), whose sum is σ = 63361474560. Its totient is φ = 46975943520.

The previous prime is 55123123493. The next prime is 55123123547. The reversal of 55123123531 is 13532132155.

55123123531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 55123123531 - 2⁷ = 55123123403 is a prime.

It is a super-2 number, since 2×55123123531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55123123493 and 55123123502.

It is not an unprimeable number, because it can be changed into a prime (55123123591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2756290 + ... + 2776216.

It is an arithmetic number, because the mean of its divisors is an integer number (3960092160).

Almost surely, 2^55123123531 is an apocalyptic number.

55123123531 is a deficient number, since it is larger than the sum of its proper divisors (8238351029).

55123123531 is a wasteful number, since it uses less digits than its factorization.

55123123531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22194.

The product of its digits is 13500, while the sum is 31.

Adding to 55123123531 its reverse (13532132155), we get a palindrome (68655255686).

The spelling of 55123123531 in words is "fifty-five billion, one hundred twenty-three million, one hundred twenty-three thousand, five hundred thirty-one".