16247561 has 4 divisors (see below), whose sum is σ = 17724624. Its totient is φ = 14770500.

The previous prime is 16247513. The next prime is 16247587. The reversal of 16247561 is 16574261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16247561 - 2²² = 12053257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16247501) 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, 738515 + ... + 738536.

It is an arithmetic number, because the mean of its divisors is an integer number (4431156).

Almost surely, 2^16247561 is an apocalyptic number.

16247561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16247561 is a deficient number, since it is larger than the sum of its proper divisors (1477063).

16247561 is a wasteful number, since it uses less digits than its factorization.

16247561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1477062.

The product of its digits is 10080, while the sum is 32.

The square root of 16247561 is about 4030.8263420793. The cubic root of 16247561 is about 253.2771780349.

The spelling of 16247561 in words is "sixteen million, two hundred forty-seven thousand, five hundred sixty-one".