61959209 has 16 divisors (see below), whose sum is σ = 70788480. Its totient is φ = 53758080.

The previous prime is 61959199. The next prime is 61959221. The reversal of 61959209 is 90295916.

61959209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 61959209 - 2⁴ = 61959193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61959409) 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 15 ways as a sum of consecutive naturals, for example, 32924 + ... + 34754.

It is an arithmetic number, because the mean of its divisors is an integer number (4424280).

Almost surely, 2^61959209 is an apocalyptic number.

It is an amenable number.

61959209 is a deficient number, since it is larger than the sum of its proper divisors (8829271).

61959209 is a wasteful number, since it uses less digits than its factorization.

61959209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2000.

The product of its (nonzero) digits is 43740, while the sum is 41.

The square root of 61959209 is about 7871.4172167406. The cubic root of 61959209 is about 395.7023428090.

The spelling of 61959209 in words is "sixty-one million, nine hundred fifty-nine thousand, two hundred nine".