16947491 has 4 divisors (see below), whose sum is σ = 18488184. Its totient is φ = 15406800.

The previous prime is 16947479. The next prime is 16947529. The reversal of 16947491 is 19474961.

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 16947491 - 2²² = 12753187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16947431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 770330 + ... + 770351.

It is an arithmetic number, because the mean of its divisors is an integer number (4622046).

Almost surely, 2^16947491 is an apocalyptic number.

16947491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16947491 is a deficient number, since it is larger than the sum of its proper divisors (1540693).

16947491 is a wasteful number, since it uses less digits than its factorization.

16947491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540692.

The product of its digits is 54432, while the sum is 41.

The square root of 16947491 is about 4116.7330493973. The cubic root of 16947491 is about 256.8631499004.

The spelling of 16947491 in words is "sixteen million, nine hundred forty-seven thousand, four hundred ninety-one".