138539201 has 4 divisors (see below), whose sum is σ = 140208432. Its totient is φ = 136869972.

The previous prime is 138539179. The next prime is 138539209. The reversal of 138539201 is 102935831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 102935831 = 103 ⋅999377.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138539201 is a prime.

It is a super-2 number, since 2×138539201² = 38386220427436802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138539209) 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, 834491 + ... + 834656.

It is an arithmetic number, because the mean of its divisors is an integer number (35052108).

Almost surely, 2^138539201 is an apocalyptic number.

It is an amenable number.

138539201 is a deficient number, since it is larger than the sum of its proper divisors (1669231).

138539201 is an equidigital number, since it uses as much as digits as its factorization.

138539201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669230.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 138539201 is about 11770.2676690040. The cubic root of 138539201 is about 517.4370944253.

The spelling of 138539201 in words is "one hundred thirty-eight million, five hundred thirty-nine thousand, two hundred one".