16125391 has 2 divisors, whose sum is σ = 16125392. Its totient is φ = 16125390.

The previous prime is 16125383. The next prime is 16125443. The reversal of 16125391 is 19352161.

It is a weak prime.

It is an emirp because it is prime and its reverse (19352161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16125391 - 2³ = 16125383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16125191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8062695 + 8062696.

It is an arithmetic number, because the mean of its divisors is an integer number (8062696).

Almost surely, 2^16125391 is an apocalyptic number.

16125391 is a deficient number, since it is larger than the sum of its proper divisors (1).

16125391 is an equidigital number, since it uses as much as digits as its factorization.

16125391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 28.

The square root of 16125391 is about 4015.6432859506. The cubic root of 16125391 is about 252.6407593437.

It can be divided in two parts, 161 and 25391, that added together give a palindrome (25552).

The spelling of 16125391 in words is "sixteen million, one hundred twenty-five thousand, three hundred ninety-one".