138091201 has 4 divisors (see below), whose sum is σ = 138128004. Its totient is φ = 138054400.

The previous prime is 138091199. The next prime is 138091229. The reversal of 138091201 is 102190831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 102190831 = 47 ⋅2174273.

It can be written as a sum of positive squares in 2 ways, for example, as 125417601 + 12673600 = 11199^2 + 3560^2 .

It is a cyclic number.

It is not a de Polignac number, because 138091201 - 2¹ = 138091199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138091501) 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, 12040 + ... + 20521.

It is an arithmetic number, because the mean of its divisors is an integer number (34532001).

Almost surely, 2^138091201 is an apocalyptic number.

It is an amenable number.

138091201 is a deficient number, since it is larger than the sum of its proper divisors (36803).

138091201 is an equidigital number, since it uses as much as digits as its factorization.

138091201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36802.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 138091201 is about 11751.2212556823. The cubic root of 138091201 is about 516.8787394864.

The spelling of 138091201 in words is "one hundred thirty-eight million, ninety-one thousand, two hundred one".