138118951 has 4 divisors (see below), whose sum is σ = 138147952. Its totient is φ = 138089952.

The previous prime is 138118949. The next prime is 138118969. The reversal of 138118951 is 159811831.

138118951 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 159811831 = 19 ⋅8411149.

It is a cyclic number.

It is not a de Polignac number, because 138118951 - 2¹ = 138118949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138118951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138118991) 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, 5490 + ... + 17503.

It is an arithmetic number, because the mean of its divisors is an integer number (34536988).

Almost surely, 2^138118951 is an apocalyptic number.

138118951 is a deficient number, since it is larger than the sum of its proper divisors (29001).

138118951 is an equidigital number, since it uses as much as digits as its factorization.

138118951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29000.

The product of its digits is 8640, while the sum is 37.

The square root of 138118951 is about 11752.4019247131. The cubic root of 138118951 is about 516.9133601434.

The spelling of 138118951 in words is "one hundred thirty-eight million, one hundred eighteen thousand, nine hundred fifty-one".