561421439 has 8 divisors (see below), whose sum is σ = 591863808. Its totient is φ = 531749880.

The previous prime is 561421433. The next prime is 561421451. The reversal of 561421439 is 934124165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 561421439 - 2⁴ = 561421423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 561421399 and 561421408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561421433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191207 + ... + 194120.

It is an arithmetic number, because the mean of its divisors is an integer number (73982976).

Almost surely, 2^561421439 is an apocalyptic number.

561421439 is a deficient number, since it is larger than the sum of its proper divisors (30442369).

561421439 is a wasteful number, since it uses less digits than its factorization.

561421439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385405.

The product of its digits is 25920, while the sum is 35.

The square root of 561421439 is about 23694.3334787033. Note that the first 3 decimals coincide. The cubic root of 561421439 is about 824.9538702092.

The spelling of 561421439 in words is "five hundred sixty-one million, four hundred twenty-one thousand, four hundred thirty-nine".