123351520136 has 32 divisors (see below), whose sum is σ = 249564634200. Its totient is φ = 56819596800.

The previous prime is 123351520037. The next prime is 123351520157. The reversal of 123351520136 is 631025153321.

It can be written as a sum of positive squares in 4 ways, for example, as 84451847236 + 38899672900 = 290606^2 + 197230^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1112165 + ... + 1218036.

Almost surely, 2^123351520136 is an apocalyptic number.

It is an amenable number.

123351520136 is an abundant number, since it is smaller than the sum of its proper divisors (126213114064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123351520136 is a wasteful number, since it uses less digits than its factorization.

123351520136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2330729 (or 2330725 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 32.

Adding to 123351520136 its reverse (631025153321), we get a palindrome (754376673457).

The spelling of 123351520136 in words is "one hundred twenty-three billion, three hundred fifty-one million, five hundred twenty thousand, one hundred thirty-six".