123531021531045 has 48 divisors (see below), whose sum is σ = 216713757641472. Its totient is φ = 65085366084480.

The previous prime is 123531021531037. The next prime is 123531021531091. The reversal of 123531021531045 is 540135120135321.

It is a happy number.

123531021531045 is a `hidden beast` number, since 1 + 2 + 3 + 5 + 310 + 21 + 5 + 310 + 4 + 5 = 666.

It is not a de Polignac number, because 123531021531045 - 2³ = 123531021531037 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 59148147 + ... + 61201023.

It is an arithmetic number, because the mean of its divisors is an integer number (4514869950864).

Almost surely, 2^{123531021531045} is an apocalyptic number.

123531021531045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123531021531045 is a deficient number, since it is larger than the sum of its proper divisors (93182736110427).

123531021531045 is a wasteful number, since it uses less digits than its factorization.

123531021531045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2069082 (or 2069079 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

Adding to 123531021531045 its reverse (540135120135321), we get a palindrome (663666141666366).

The spelling of 123531021531045 in words is "one hundred twenty-three trillion, five hundred thirty-one billion, twenty-one million, five hundred thirty-one thousand, forty-five".