61717899 has 16 divisors (see below), whose sum is σ = 83825280. Its totient is φ = 40385280.

The previous prime is 61717897. The next prime is 61717913. The reversal of 61717899 is 99871716.

It is a happy number.

It is not a de Polignac number, because 61717899 - 2¹ = 61717897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61717891) 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 15 ways as a sum of consecutive naturals, for example, 37312 + ... + 38930.

It is an arithmetic number, because the mean of its divisors is an integer number (5239080).

Almost surely, 2^61717899 is an apocalyptic number.

61717899 is a deficient number, since it is larger than the sum of its proper divisors (22107381).

61717899 is a wasteful number, since it uses less digits than its factorization.

61717899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1850.

The product of its digits is 190512, while the sum is 48.

The square root of 61717899 is about 7856.0740195087. The cubic root of 61717899 is about 395.1879658728.

The spelling of 61717899 in words is "sixty-one million, seven hundred seventeen thousand, eight hundred ninety-nine".