16151321 has 2 divisors, whose sum is σ = 16151322. Its totient is φ = 16151320.

The previous prime is 16151299. The next prime is 16151339. The reversal of 16151321 is 12315161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16000000 + 151321 = 4000^2 + 389^2 .

It is an emirp because it is prime and its reverse (12315161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16151321 - 2¹⁸ = 15889177 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 16151293 and 16151302.

It is not a weakly prime, because it can be changed into another prime (16151021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8075660 + 8075661.

It is an arithmetic number, because the mean of its divisors is an integer number (8075661).

Almost surely, 2^16151321 is an apocalyptic number.

It is an amenable number.

16151321 is a deficient number, since it is larger than the sum of its proper divisors (1).

16151321 is an equidigital number, since it uses as much as digits as its factorization.

16151321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180, while the sum is 20.

The square root of 16151321 is about 4018.8706124980. The cubic root of 16151321 is about 252.7761042096.

Adding to 16151321 its reverse (12315161), we get a palindrome (28466482).

It can be divided in two parts, 16 and 151321, that multiplied together give a square (2421136 = 1556²).

The spelling of 16151321 in words is "sixteen million, one hundred fifty-one thousand, three hundred twenty-one".