16111901 has 4 divisors (see below), whose sum is σ = 17351292. Its totient is φ = 14872512.

The previous prime is 16111883. The next prime is 16111919. The reversal of 16111901 is 10911161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10911161 = 17 ⋅641833.

It is an interprime number because it is at equal distance from previous prime (16111883) and next prime (16111919).

It can be written as a sum of positive squares in 2 ways, for example, as 4202500 + 11909401 = 2050^2 + 3451^2 .

It is a cyclic number.

It is not a de Polignac number, because 16111901 - 2¹⁰ = 16110877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16111961) 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, 619676 + ... + 619701.

It is an arithmetic number, because the mean of its divisors is an integer number (4337823).

Almost surely, 2^16111901 is an apocalyptic number.

It is an amenable number.

16111901 is a deficient number, since it is larger than the sum of its proper divisors (1239391).

16111901 is a wasteful number, since it uses less digits than its factorization.

16111901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239390.

The product of its (nonzero) digits is 54, while the sum is 20.

The square root of 16111901 is about 4013.9632534442. The cubic root of 16111901 is about 252.5702892248.

The spelling of 16111901 in words is "sixteen million, one hundred eleven thousand, nine hundred one".