138552550 has 24 divisors (see below), whose sum is σ = 272868696. Its totient is φ = 52160640.

The previous prime is 138552539. The next prime is 138552553. The reversal of 138552550 is 55255831.

138552550 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×138552550² = 38393618223005000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138552553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80652 + ... + 82351.

It is an arithmetic number, because the mean of its divisors is an integer number (11369529).

Almost surely, 2^138552550 is an apocalyptic number.

138552550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138552550 is a deficient number, since it is larger than the sum of its proper divisors (134316146).

138552550 is a wasteful number, since it uses less digits than its factorization.

138552550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163032 (or 163027 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 34.

The square root of 138552550 is about 11770.8347197639. The cubic root of 138552550 is about 517.4537131775.

It can be divided in two parts, 1385 and 52550, that added together give a palindrome (53935).

The spelling of 138552550 in words is "one hundred thirty-eight million, five hundred fifty-two thousand, five hundred fifty".