138102551 has 4 divisors (see below), whose sum is σ = 142557504. Its totient is φ = 133647600.

The previous prime is 138102527. The next prime is 138102563. The reversal of 138102551 is 155201831.

It is a happy number.

138102551 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: 155201831 = 241 ⋅643991.

It is a cyclic number.

It is not a de Polignac number, because 138102551 - 2²⁶ = 70993687 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 138102551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138102521) 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, 2227430 + ... + 2227491.

It is an arithmetic number, because the mean of its divisors is an integer number (35639376).

Almost surely, 2^138102551 is an apocalyptic number.

138102551 is a deficient number, since it is larger than the sum of its proper divisors (4454953).

138102551 is an equidigital number, since it uses as much as digits as its factorization.

138102551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4454952.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 138102551 is about 11751.7041742889. The cubic root of 138102551 is about 516.8929002075.

It can be divided in two parts, 13810 and 2551, that added together give a palindrome (16361).

The spelling of 138102551 in words is "one hundred thirty-eight million, one hundred two thousand, five hundred fifty-one".