55123431031 has 2 divisors, whose sum is σ = 55123431032. Its totient is φ = 55123431030.

The previous prime is 55123431001. The next prime is 55123431053. The reversal of 55123431031 is 13013432155.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55123431031 - 2¹⁹ = 55122906743 is a prime.

It is a super-2 number, since 2×55123431031² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55123431001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27561715515 + 27561715516.

It is an arithmetic number, because the mean of its divisors is an integer number (27561715516).

Almost surely, 2^55123431031 is an apocalyptic number.

55123431031 is a deficient number, since it is larger than the sum of its proper divisors (1).

55123431031 is an equidigital number, since it uses as much as digits as its factorization.

55123431031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 28.

Adding to 55123431031 its reverse (13013432155), we get a palindrome (68136863186).

The spelling of 55123431031 in words is "fifty-five billion, one hundred twenty-three million, four hundred thirty-one thousand, thirty-one".