138261355 has 4 divisors (see below), whose sum is σ = 165913632. Its totient is φ = 110609080.

The previous prime is 138261301. The next prime is 138261371. The reversal of 138261355 is 553162831.

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

It is not a de Polignac number, because 138261355 - 2¹¹ = 138259307 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 138261355.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13826131 + ... + 13826140.

It is an arithmetic number, because the mean of its divisors is an integer number (41478408).

Almost surely, 2^138261355 is an apocalyptic number.

138261355 is a deficient number, since it is larger than the sum of its proper divisors (27652277).

138261355 is an equidigital number, since it uses as much as digits as its factorization.

138261355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27652276.

The product of its digits is 21600, while the sum is 34.

The square root of 138261355 is about 11758.4588701071. The cubic root of 138261355 is about 517.0909492095.

The spelling of 138261355 in words is "one hundred thirty-eight million, two hundred sixty-one thousand, three hundred fifty-five".