16377121 has 2 divisors, whose sum is σ = 16377122. Its totient is φ = 16377120.

The previous prime is 16377091. The next prime is 16377131. The reversal of 16377121 is 12177361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12531600 + 3845521 = 3540^2 + 1961^2 .

It is a cyclic number.

It is not a de Polignac number, because 16377121 - 2⁵ = 16377089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16377121.

It is not a weakly prime, because it can be changed into another prime (16377131) 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, 8188560 + 8188561.

It is an arithmetic number, because the mean of its divisors is an integer number (8188561).

Almost surely, 2^16377121 is an apocalyptic number.

It is an amenable number.

16377121 is a deficient number, since it is larger than the sum of its proper divisors (1).

16377121 is an equidigital number, since it uses as much as digits as its factorization.

16377121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1764, while the sum is 28.

The square root of 16377121 is about 4046.8655772091. The cubic root of 16377121 is about 253.9486173369.

It can be divided in two parts, 163 and 77121, that added together give a square (77284 = 278²).

The spelling of 16377121 in words is "sixteen million, three hundred seventy-seven thousand, one hundred twenty-one".