61892009 has 8 divisors (see below), whose sum is σ = 63760200. Its totient is φ = 60034176.

The previous prime is 61891957. The next prime is 61892029. The reversal of 61892009 is 90029816.

61892009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 40704400 + 21187609 = 6380^2 + 4603^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61892009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61892009.

It is not an unprimeable number, because it can be changed into a prime (61892029) 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 7 ways as a sum of consecutive naturals, for example, 10517 + ... + 15309.

It is an arithmetic number, because the mean of its divisors is an integer number (7970025).

Almost surely, 2^61892009 is an apocalyptic number.

It is an amenable number.

61892009 is a deficient number, since it is larger than the sum of its proper divisors (1868191).

61892009 is a wasteful number, since it uses less digits than its factorization.

61892009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5179.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 61892009 is about 7867.1474499974. The cubic root of 61892009 is about 395.5592335111.

The spelling of 61892009 in words is "sixty-one million, eight hundred ninety-two thousand, nine".