16601881 has 2 divisors, whose sum is σ = 16601882. Its totient is φ = 16601880.

The previous prime is 16601869. The next prime is 16601903. The reversal of 16601881 is 18810661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8649481 + 7952400 = 2941^2 + 2820^2 .

It is an emirp because it is prime and its reverse (18810661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16601881 - 2¹¹ = 16599833 is a prime.

It is a super-2 number, since 2×16601881² = 551244905476322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16601861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8300940 + 8300941.

It is an arithmetic number, because the mean of its divisors is an integer number (8300941).

Almost surely, 2^16601881 is an apocalyptic number.

It is an amenable number.

16601881 is a deficient number, since it is larger than the sum of its proper divisors (1).

16601881 is an equidigital number, since it uses as much as digits as its factorization.

16601881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 16601881 is about 4074.5405876000. The cubic root of 16601881 is about 255.1050752409.

The spelling of 16601881 in words is "sixteen million, six hundred one thousand, eight hundred eighty-one".