138632280251 has 4 divisors (see below), whose sum is σ = 138825093600. Its totient is φ = 138439466904.

The previous prime is 138632280233. The next prime is 138632280263. The reversal of 138632280251 is 152082236831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138632280251 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138632280199 and 138632280208.

It is not an unprimeable number, because it can be changed into a prime (138632280551) 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, 96405596 + ... + 96407033.

It is an arithmetic number, because the mean of its divisors is an integer number (34706273400).

Almost surely, 2^138632280251 is an apocalyptic number.

138632280251 is a deficient number, since it is larger than the sum of its proper divisors (192813349).

138632280251 is an equidigital number, since it uses as much as digits as its factorization.

138632280251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192813348.

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 138632280251 in words is "one hundred thirty-eight billion, six hundred thirty-two million, two hundred eighty thousand, two hundred fifty-one".