16321261 has 8 divisors (see below), whose sum is σ = 17845344. Its totient is φ = 14803920.

The previous prime is 16321259. The next prime is 16321271. The reversal of 16321261 is 16212361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16321261 - 2¹ = 16321259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16321211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4335 + ... + 7171.

It is an arithmetic number, because the mean of its divisors is an integer number (2230668).

Almost surely, 2^16321261 is an apocalyptic number.

16321261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16321261 is a deficient number, since it is larger than the sum of its proper divisors (1524083).

16321261 is a wasteful number, since it uses less digits than its factorization.

16321261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3371.

The product of its digits is 432, while the sum is 22.

The square root of 16321261 is about 4039.9580443366. The cubic root of 16321261 is about 253.6595610633.

Subtracting from 16321261 its reverse (16212361), we obtain a square (108900 = 330²).

The spelling of 16321261 in words is "sixteen million, three hundred twenty-one thousand, two hundred sixty-one".