123445355531 has 16 divisors (see below), whose sum is σ = 126586855200. Its totient is φ = 120348011520.

The previous prime is 123445355459. The next prime is 123445355549. The reversal of 123445355531 is 135553544321.

It is a cyclic number.

It is not a de Polignac number, because 123445355531 - 2¹⁰ = 123445354507 is a prime.

It is a super-2 number, since 2×123445355531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123445355431) 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, 2742971 + ... + 2787611.

It is an arithmetic number, because the mean of its divisors is an integer number (7911678450).

Almost surely, 2^123445355531 is an apocalyptic number.

123445355531 is a deficient number, since it is larger than the sum of its proper divisors (3141499669).

123445355531 is a wasteful number, since it uses less digits than its factorization.

123445355531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45134.

The product of its digits is 540000, while the sum is 41.

Adding to 123445355531 its reverse (135553544321), we get a palindrome (258998899852).

The spelling of 123445355531 in words is "one hundred twenty-three billion, four hundred forty-five million, three hundred fifty-five thousand, five hundred thirty-one".