138901111 has 4 divisors (see below), whose sum is σ = 143381824. Its totient is φ = 134420400.

The previous prime is 138901093. The next prime is 138901123. The reversal of 138901111 is 111109831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111109831 = 7 ⋅15872833.

It is a cyclic number.

It is not a de Polignac number, because 138901111 - 2¹⁵ = 138868343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138901151) 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, 2240310 + ... + 2240371.

It is an arithmetic number, because the mean of its divisors is an integer number (35845456).

Almost surely, 2^138901111 is an apocalyptic number.

138901111 is a deficient number, since it is larger than the sum of its proper divisors (4480713).

138901111 is an equidigital number, since it uses as much as digits as its factorization.

138901111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4480712.

The product of its (nonzero) digits is 216, while the sum is 25.

The square root of 138901111 is about 11785.6315486273. The cubic root of 138901111 is about 517.8872746564.

It can be divided in two parts, 13890 and 1111, that multiplied together give a triangular number (15431790 = T₅₅₅₅).

The spelling of 138901111 in words is "one hundred thirty-eight million, nine hundred one thousand, one hundred eleven".