16627861 has 2 divisors, whose sum is σ = 16627862. Its totient is φ = 16627860.

The previous prime is 16627829. The next prime is 16627879. The reversal of 16627861 is 16872661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10201636 + 6426225 = 3194^2 + 2535^2 .

It is a cyclic number.

It is not a de Polignac number, because 16627861 - 2⁵ = 16627829 is a prime.

It is a super-2 number, since 2×16627861² = 552971522870642, which contains 22 as substring.

It is equal to p_1068859 and since 16627861 and 1068859 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16627861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16627361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8313930 + 8313931.

It is an arithmetic number, because the mean of its divisors is an integer number (8313931).

Almost surely, 2^16627861 is an apocalyptic number.

It is an amenable number.

16627861 is a deficient number, since it is larger than the sum of its proper divisors (1).

16627861 is an equidigital number, since it uses as much as digits as its factorization.

16627861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 37.

The square root of 16627861 is about 4077.7274308124. The cubic root of 16627861 is about 255.2380757466.

The spelling of 16627861 in words is "sixteen million, six hundred twenty-seven thousand, eight hundred sixty-one".