16861111 has 2 divisors, whose sum is σ = 16861112. Its totient is φ = 16861110.

The previous prime is 16861087. The next prime is 16861129. The reversal of 16861111 is 11116861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16861111 - 2¹³ = 16852919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16861171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8430555 + 8430556.

It is an arithmetic number, because the mean of its divisors is an integer number (8430556).

Almost surely, 2^16861111 is an apocalyptic number.

16861111 is a deficient number, since it is larger than the sum of its proper divisors (1).

16861111 is an equidigital number, since it uses as much as digits as its factorization.

16861111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 25.

The square root of 16861111 is about 4106.2283180554. The cubic root of 16861111 is about 256.4260027432.

Adding to 16861111 its reverse (11116861), we get a palindrome (27977972).

The spelling of 16861111 in words is "sixteen million, eight hundred sixty-one thousand, one hundred eleven".