16131309 has 4 divisors (see below), whose sum is σ = 21508416. Its totient is φ = 10754204.

The previous prime is 16131307. The next prime is 16131319. The reversal of 16131309 is 90313161.

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: 90313161 = 3 ⋅30104387.

It is a cyclic number.

It is not a de Polignac number, because 16131309 - 2¹ = 16131307 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16131307) 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, 2688549 + ... + 2688554.

It is an arithmetic number, because the mean of its divisors is an integer number (5377104).

Almost surely, 2^16131309 is an apocalyptic number.

It is an amenable number.

16131309 is a deficient number, since it is larger than the sum of its proper divisors (5377107).

16131309 is an equidigital number, since it uses as much as digits as its factorization.

16131309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5377106.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 16131309 is about 4016.3800865954. The cubic root of 16131309 is about 252.6716618532.

The spelling of 16131309 in words is "sixteen million, one hundred thirty-one thousand, three hundred nine".