56145409 has 4 divisors (see below), whose sum is σ = 56215620. Its totient is φ = 56075200.

The previous prime is 56145347. The next prime is 56145413. The reversal of 56145409 is 90454165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90454165 = 5 ⋅18090833.

It can be written as a sum of positive squares in 2 ways, for example, as 43930384 + 12215025 = 6628^2 + 3495^2 .

It is a cyclic number.

It is not a de Polignac number, because 56145409 - 2⁷ = 56145281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56145449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33892 + ... + 35509.

It is an arithmetic number, because the mean of its divisors is an integer number (14053905).

Almost surely, 2^56145409 is an apocalyptic number.

It is an amenable number.

56145409 is a deficient number, since it is larger than the sum of its proper divisors (70211).

56145409 is an equidigital number, since it uses as much as digits as its factorization.

56145409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70210.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 56145409 is about 7493.0240223824. The cubic root of 56145409 is about 382.9170901301.

The spelling of 56145409 in words is "fifty-six million, one hundred forty-five thousand, four hundred nine".