61842409 has 4 divisors (see below), whose sum is σ = 61870804. Its totient is φ = 61814016.

The previous prime is 61842383. The next prime is 61842421. The reversal of 61842409 is 90424816.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36036009 + 25806400 = 6003^2 + 5080^2 .

It is a cyclic number.

It is not a de Polignac number, because 61842409 - 2¹³ = 61834217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61842449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10632 + ... + 15385.

It is an arithmetic number, because the mean of its divisors is an integer number (15467701).

Almost surely, 2^61842409 is an apocalyptic number.

It is an amenable number.

61842409 is a deficient number, since it is larger than the sum of its proper divisors (28395).

61842409 is a wasteful number, since it uses less digits than its factorization.

61842409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28394.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 61842409 is about 7863.9944684619. The cubic root of 61842409 is about 395.4535387604.

The spelling of 61842409 in words is "sixty-one million, eight hundred forty-two thousand, four hundred nine".