123138591851 has 8 divisors (see below), whose sum is σ = 134343414000. Its totient is φ = 111935503840.

The previous prime is 123138591847. The next prime is 123138591853. The reversal of 123138591851 is 158195831321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123138591851 - 2² = 123138591847 is a prime.

It is a super-2 number, since 2×123138591851² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123138591796 and 123138591805.

It is not an unprimeable number, because it can be changed into a prime (123138591853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282776 + ... + 571173.

It is an arithmetic number, because the mean of its divisors is an integer number (16792926750).

Almost surely, 2^123138591851 is an apocalyptic number.

123138591851 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123138591851 is a deficient number, since it is larger than the sum of its proper divisors (11204822149).

123138591851 is a wasteful number, since it uses less digits than its factorization.

123138591851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867069.

The product of its digits is 259200, while the sum is 47.

The spelling of 123138591851 in words is "one hundred twenty-three billion, one hundred thirty-eight million, five hundred ninety-one thousand, eight hundred fifty-one".