16151621 has 2 divisors, whose sum is σ = 16151622. Its totient is φ = 16151620.

The previous prime is 16151609. The next prime is 16151627. The reversal of 16151621 is 12615161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15100996 + 1050625 = 3886^2 + 1025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16151621 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16151627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8075810 + 8075811.

It is an arithmetic number, because the mean of its divisors is an integer number (8075811).

Almost surely, 2^16151621 is an apocalyptic number.

It is an amenable number.

16151621 is a deficient number, since it is larger than the sum of its proper divisors (1).

16151621 is an equidigital number, since it uses as much as digits as its factorization.

16151621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 23.

The square root of 16151621 is about 4018.9079362434. The cubic root of 16151621 is about 252.7776692491. Note that the first 3 decimals are identical.

Adding to 16151621 its reverse (12615161), we get a palindrome (28766782).

The spelling of 16151621 in words is "sixteen million, one hundred fifty-one thousand, six hundred twenty-one".