61701809 has 8 divisors (see below), whose sum is σ = 67107432. Its totient is φ = 56390400.

The previous prime is 61701803. The next prime is 61701817. The reversal of 61701809 is 90810716.

It can be written as a sum of positive squares in 4 ways, for example, as 2411809 + 59290000 = 1553^2 + 7700^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 61701809 - 2⁴ = 61701793 is a prime.

It is a super-2 number, since 2×61701809² = 7614226467744962, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61701803) 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 7 ways as a sum of consecutive naturals, for example, 22184 + ... + 24809.

It is an arithmetic number, because the mean of its divisors is an integer number (8388429).

Almost surely, 2^61701809 is an apocalyptic number.

It is an amenable number.

61701809 is a deficient number, since it is larger than the sum of its proper divisors (5405623).

61701809 is a wasteful number, since it uses less digits than its factorization.

61701809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47107.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 61701809 is about 7855.0499043609. The cubic root of 61701809 is about 395.1536207470.

The spelling of 61701809 in words is "sixty-one million, seven hundred one thousand, eight hundred nine".