16931217 has 8 divisors (see below), whose sum is σ = 22643296. Its totient is φ = 11253312.

The previous prime is 16931209. The next prime is 16931219. The reversal of 16931217 is 71213961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16931217 - 2³ = 16931209 is a prime.

It is a super-2 number, since 2×16931217² = 573332218202178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16931219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7363 + ... + 9384.

It is an arithmetic number, because the mean of its divisors is an integer number (2830412).

Almost surely, 2^16931217 is an apocalyptic number.

It is an amenable number.

16931217 is a deficient number, since it is larger than the sum of its proper divisors (5712079).

16931217 is a wasteful number, since it uses less digits than its factorization.

16931217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17087.

The product of its digits is 2268, while the sum is 30.

The square root of 16931217 is about 4114.7560073472. The cubic root of 16931217 is about 256.7809050883.

The spelling of 16931217 in words is "sixteen million, nine hundred thirty-one thousand, two hundred seventeen".