16543961 has 4 divisors (see below), whose sum is σ = 18907392. Its totient is φ = 14180532.

The previous prime is 16543957. The next prime is 16543979. The reversal of 16543961 is 16934561.

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 16543961 - 2² = 16543957 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16543931) 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, 1181705 + ... + 1181718.

It is an arithmetic number, because the mean of its divisors is an integer number (4726848).

Almost surely, 2^16543961 is an apocalyptic number.

It is an amenable number.

16543961 is a deficient number, since it is larger than the sum of its proper divisors (2363431).

16543961 is an equidigital number, since it uses as much as digits as its factorization.

16543961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2363430.

The product of its digits is 19440, while the sum is 35.

The square root of 16543961 is about 4067.4268278606. The cubic root of 16543961 is about 254.8080626657.

The spelling of 16543961 in words is "sixteen million, five hundred forty-three thousand, nine hundred sixty-one".