16381577 has 2 divisors, whose sum is σ = 16381578. Its totient is φ = 16381576.

The previous prime is 16381513. The next prime is 16381579. The reversal of 16381577 is 77518361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14714896 + 1666681 = 3836^2 + 1291^2 .

It is an emirp because it is prime and its reverse (77518361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16381577 - 2⁶ = 16381513 is a prime.

Together with 16381579, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16381577.

It is not a weakly prime, because it can be changed into another prime (16381579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8190788 + 8190789.

It is an arithmetic number, because the mean of its divisors is an integer number (8190789).

Almost surely, 2^16381577 is an apocalyptic number.

It is an amenable number.

16381577 is a deficient number, since it is larger than the sum of its proper divisors (1).

16381577 is an equidigital number, since it uses as much as digits as its factorization.

16381577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 38.

The square root of 16381577 is about 4047.4160893093. The cubic root of 16381577 is about 253.9716472785.

The spelling of 16381577 in words is "sixteen million, three hundred eighty-one thousand, five hundred seventy-seven".