16487621 has 2 divisors, whose sum is σ = 16487622. Its totient is φ = 16487620.

The previous prime is 16487593. The next prime is 16487641. The reversal of 16487621 is 12678461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10660225 + 5827396 = 3265^2 + 2414^2 .

It is an emirp because it is prime and its reverse (12678461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16487621 - 2⁶ = 16487557 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 (16487641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8243810 + 8243811.

It is an arithmetic number, because the mean of its divisors is an integer number (8243811).

Almost surely, 2^16487621 is an apocalyptic number.

It is an amenable number.

16487621 is a deficient number, since it is larger than the sum of its proper divisors (1).

16487621 is an equidigital number, since it uses as much as digits as its factorization.

16487621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 16487621 is about 4060.4951668485. The cubic root of 16487621 is about 254.5184864402.

It can be divided in two parts, 164876 and 21, that multiplied together give a triangular number (3462396 = T₂₆₃₁).

The spelling of 16487621 in words is "sixteen million, four hundred eighty-seven thousand, six hundred twenty-one".