16861831 has 12 divisors (see below), whose sum is σ = 19727472. Its totient is φ = 14370048.

The previous prime is 16861811. The next prime is 16861837. The reversal of 16861831 is 13816861.

It is not a de Polignac number, because 16861831 - 2¹⁷ = 16730759 is a prime.

It is a super-2 number, since 2×16861831² = 568642689345122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16861837) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8566 + ... + 10348.

It is an arithmetic number, because the mean of its divisors is an integer number (1643956).

Almost surely, 2^16861831 is an apocalyptic number.

16861831 is a deficient number, since it is larger than the sum of its proper divisors (2865641).

16861831 is a wasteful number, since it uses less digits than its factorization.

16861831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1990 (or 1983 counting only the distinct ones).

The product of its digits is 6912, while the sum is 34.

The square root of 16861831 is about 4106.3159888153. The cubic root of 16861831 is about 256.4296526429.

The spelling of 16861831 in words is "sixteen million, eight hundred sixty-one thousand, eight hundred thirty-one".