16904531 has 4 divisors (see below), whose sum is σ = 19319472. Its totient is φ = 14489592.

The previous prime is 16904521. The next prime is 16904533. The reversal of 16904531 is 13540961.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16904531 - 2⁶ = 16904467 is a prime.

It is a super-2 number, since 2×16904531² = 571526336659922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16904494 and 16904503.

It is not an unprimeable number, because it can be changed into a prime (16904533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1207460 + ... + 1207473.

It is an arithmetic number, because the mean of its divisors is an integer number (4829868).

Almost surely, 2^16904531 is an apocalyptic number.

16904531 is a deficient number, since it is larger than the sum of its proper divisors (2414941).

16904531 is an equidigital number, since it uses as much as digits as its factorization.

16904531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2414940.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 16904531 is about 4111.5120089816. The cubic root of 16904531 is about 256.6459264364.

The spelling of 16904531 in words is "sixteen million, nine hundred four thousand, five hundred thirty-one".