123541572321 has 36 divisors (see below), whose sum is σ = 194187069804. Its totient is φ = 75625574400.

The previous prime is 123541572269. The next prime is 123541572359. The reversal of 123541572321 is 123275145321.

123541572321 is a `hidden beast` number, since 1 + 2 + 3 + 5 + 415 + 7 + 232 + 1 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 3381921 + 123538190400 = 1839^2 + 351480^2 .

It is not a de Polignac number, because 123541572321 - 2¹⁷ = 123541441249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123541573321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 472600 + ... + 685881.

Almost surely, 2^123541572321 is an apocalyptic number.

It is an amenable number.

123541572321 is a deficient number, since it is larger than the sum of its proper divisors (70645497483).

123541572321 is a wasteful number, since it uses less digits than its factorization.

123541572321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158562 (or 1158542 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The spelling of 123541572321 in words is "one hundred twenty-three billion, five hundred forty-one million, five hundred seventy-two thousand, three hundred twenty-one".