561994941 has 4 divisors (see below), whose sum is σ = 749326592. Its totient is φ = 374663292.

The previous prime is 561994919. The next prime is 561994957. The reversal of 561994941 is 149499165.

It is a happy number.

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 not a de Polignac number, because 561994941 - 2¹⁸ = 561732797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561994841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93665821 + ... + 93665826.

It is an arithmetic number, because the mean of its divisors is an integer number (187331648).

Almost surely, 2^561994941 is an apocalyptic number.

It is an amenable number.

561994941 is a deficient number, since it is larger than the sum of its proper divisors (187331651).

561994941 is a wasteful number, since it uses less digits than its factorization.

561994941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187331650.

The product of its digits is 349920, while the sum is 48.

The square root of 561994941 is about 23706.4324815017. The cubic root of 561994941 is about 825.2346763056.

The spelling of 561994941 in words is "five hundred sixty-one million, nine hundred ninety-four thousand, nine hundred forty-one".