123351520137 has 4 divisors (see below), whose sum is σ = 164468693520. Its totient is φ = 82234346756.

The previous prime is 123351520037. The next prime is 123351520157. The reversal of 123351520137 is 731025153321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 731025153321 = 3 ⋅243675051107.

It is a cyclic number.

It is not a de Polignac number, because 123351520137 - 2¹⁰ = 123351519113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123351520098 and 123351520107.

It is not an unprimeable number, because it can be changed into a prime (123351520157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20558586687 + ... + 20558586692.

It is an arithmetic number, because the mean of its divisors is an integer number (41117173380).

Almost surely, 2^123351520137 is an apocalyptic number.

It is an amenable number.

123351520137 is a deficient number, since it is larger than the sum of its proper divisors (41117173383).

123351520137 is an equidigital number, since it uses as much as digits as its factorization.

123351520137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41117173382.

The product of its (nonzero) digits is 18900, while the sum is 33.

Adding to 123351520137 its reverse (731025153321), we get a palindrome (854376673458).

The spelling of 123351520137 in words is "one hundred twenty-three billion, three hundred fifty-one million, five hundred twenty thousand, one hundred thirty-seven".