16115391 has 6 divisors (see below), whose sum is σ = 23277800. Its totient is φ = 10743588.

The previous prime is 16115389. The next prime is 16115413. The reversal of 16115391 is 19351161.

It is not a de Polignac number, because 16115391 - 2¹ = 16115389 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 (16115311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 895291 + ... + 895308.

Almost surely, 2^16115391 is an apocalyptic number.

16115391 is a deficient number, since it is larger than the sum of its proper divisors (7162409).

16115391 is a wasteful number, since it uses less digits than its factorization.

16115391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1790605 (or 1790602 counting only the distinct ones).

The product of its digits is 810, while the sum is 27.

The square root of 16115391 is about 4014.3979623351. The cubic root of 16115391 is about 252.5885243309.

The spelling of 16115391 in words is "sixteen million, one hundred fifteen thousand, three hundred ninety-one".