61823009 has 4 divisors (see below), whose sum is σ = 62435220. Its totient is φ = 61210800.

The previous prime is 61822997. The next prime is 61823029. The reversal of 61823009 is 90032816.

61823009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 41886784 + 19936225 = 6472^2 + 4465^2 .

It is a cyclic number.

It is not a de Polignac number, because 61823009 - 2⁴ = 61822993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61823029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305954 + ... + 306155.

It is an arithmetic number, because the mean of its divisors is an integer number (15608805).

Almost surely, 2^61823009 is an apocalyptic number.

It is an amenable number.

61823009 is a deficient number, since it is larger than the sum of its proper divisors (612211).

61823009 is a wasteful number, since it uses less digits than its factorization.

61823009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612210.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 61823009 is about 7862.7609018716. The cubic root of 61823009 is about 395.4121830999.

The spelling of 61823009 in words is "sixty-one million, eight hundred twenty-three thousand, nine".