56421961 has 4 divisors (see below), whose sum is σ = 56768272. Its totient is φ = 56075652.

The previous prime is 56421941. The next prime is 56421971. The reversal of 56421961 is 16912465.

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: 16912465 = 5 ⋅3382493.

It is a cyclic number.

It is not a de Polignac number, because 56421961 - 2¹⁷ = 56290889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56421901) 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, 172911 + ... + 173236.

It is an arithmetic number, because the mean of its divisors is an integer number (14192068).

Almost surely, 2^56421961 is an apocalyptic number.

It is an amenable number.

56421961 is a deficient number, since it is larger than the sum of its proper divisors (346311).

56421961 is a wasteful number, since it uses less digits than its factorization.

56421961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346310.

The product of its digits is 12960, while the sum is 34.

The square root of 56421961 is about 7511.4553183787. The cubic root of 56421961 is about 383.5447644372.

The spelling of 56421961 in words is "fifty-six million, four hundred twenty-one thousand, nine hundred sixty-one".