16909231 has 2 divisors, whose sum is σ = 16909232. Its totient is φ = 16909230.

The previous prime is 16909219. The next prime is 16909241. The reversal of 16909231 is 13290961.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16909231 - 2⁹ = 16908719 is a prime.

It is a super-2 number, since 2×16909231² = 571844186022722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16909193 and 16909202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16909241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8454615 + 8454616.

It is an arithmetic number, because the mean of its divisors is an integer number (8454616).

Almost surely, 2^16909231 is an apocalyptic number.

16909231 is a deficient number, since it is larger than the sum of its proper divisors (1).

16909231 is an equidigital number, since it uses as much as digits as its factorization.

16909231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 16909231 is about 4112.0835351437. The cubic root of 16909231 is about 256.6697094896.

The spelling of 16909231 in words is "sixteen million, nine hundred nine thousand, two hundred thirty-one".