16349381 has 2 divisors, whose sum is σ = 16349382. Its totient is φ = 16349380.

The previous prime is 16349363. The next prime is 16349401. The reversal of 16349381 is 18394361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14364100 + 1985281 = 3790^2 + 1409^2 .

It is a cyclic number.

It is not a de Polignac number, because 16349381 - 2⁶ = 16349317 is a prime.

It is a super-2 number, since 2×16349381² = 534604518166322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16349321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8174690 + 8174691.

It is an arithmetic number, because the mean of its divisors is an integer number (8174691).

Almost surely, 2^16349381 is an apocalyptic number.

It is an amenable number.

16349381 is a deficient number, since it is larger than the sum of its proper divisors (1).

16349381 is an equidigital number, since it uses as much as digits as its factorization.

16349381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 35.

The square root of 16349381 is about 4043.4367807597. The cubic root of 16349381 is about 253.8051546815.

The spelling of 16349381 in words is "sixteen million, three hundred forty-nine thousand, three hundred eighty-one".