138168150929 has 4 divisors (see below), whose sum is σ = 138209658660. Its totient is φ = 138126643200.

The previous prime is 138168150889. The next prime is 138168150943. The reversal of 138168150929 is 929051861831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 929051861831 = 293 ⋅3170825467.

It can be written as a sum of positive squares in 2 ways, for example, as 28501205329 + 109666945600 = 168823^2 + 331160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138168150929 is a prime.

It is a super-2 number, since 2×138168150929² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138168150629) 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, 20748872 + ... + 20755529.

It is an arithmetic number, because the mean of its divisors is an integer number (34552414665).

Almost surely, 2^138168150929 is an apocalyptic number.

It is an amenable number.

138168150929 is a deficient number, since it is larger than the sum of its proper divisors (41507731).

138168150929 is an equidigital number, since it uses as much as digits as its factorization.

138168150929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41507730.

The product of its (nonzero) digits is 933120, while the sum is 53.

The spelling of 138168150929 in words is "one hundred thirty-eight billion, one hundred sixty-eight million, one hundred fifty thousand, nine hundred twenty-nine".