138193551 has 6 divisors (see below), whose sum is σ = 199612920. Its totient is φ = 92129028.

The previous prime is 138193547. The next prime is 138193621. The reversal of 138193551 is 155391831.

138193551 is a `hidden beast` number, since 13 + 8 + 1 + 93 + 551 = 666.

138193551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138193551 - 2² = 138193547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138193151) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7677411 + ... + 7677428.

It is an arithmetic number, because the mean of its divisors is an integer number (33268820).

Almost surely, 2^138193551 is an apocalyptic number.

138193551 is a deficient number, since it is larger than the sum of its proper divisors (61419369).

138193551 is a wasteful number, since it uses less digits than its factorization.

138193551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15354845 (or 15354842 counting only the distinct ones).

The product of its digits is 16200, while the sum is 36.

The square root of 138193551 is about 11755.5753155684. The cubic root of 138193551 is about 517.0064074670.

The spelling of 138193551 in words is "one hundred thirty-eight million, one hundred ninety-three thousand, five hundred fifty-one".