16373561 has 4 divisors (see below), whose sum is σ = 16405392. Its totient is φ = 16341732.

The previous prime is 16373557. The next prime is 16373569. The reversal of 16373561 is 16537361.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16537361 = 149 ⋅110989.

It is a cyclic number.

It is not a de Polignac number, because 16373561 - 2² = 16373557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16373569) 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, 15131 + ... + 16176.

It is an arithmetic number, because the mean of its divisors is an integer number (4101348).

Almost surely, 2^16373561 is an apocalyptic number.

It is an amenable number.

16373561 is a deficient number, since it is larger than the sum of its proper divisors (31831).

16373561 is an equidigital number, since it uses as much as digits as its factorization.

16373561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31830.

The product of its digits is 11340, while the sum is 32.

The square root of 16373561 is about 4046.4257067194. The cubic root of 16373561 is about 253.9302151893.

The spelling of 16373561 in words is "sixteen million, three hundred seventy-three thousand, five hundred sixty-one".