61719817 has 4 divisors (see below), whose sum is σ = 61762176. Its totient is φ = 61677460.

The previous prime is 61719799. The next prime is 61719829. The reversal of 61719817 is 71891716.

61719817 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61719817 - 2¹⁵ = 61687049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61719817.

It is not an unprimeable number, because it can be changed into a prime (61719887) 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, 18913 + ... + 21934.

It is an arithmetic number, because the mean of its divisors is an integer number (15440544).

Almost surely, 2^61719817 is an apocalyptic number.

It is an amenable number.

61719817 is a deficient number, since it is larger than the sum of its proper divisors (42359).

61719817 is a wasteful number, since it uses less digits than its factorization.

61719817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42358.

The product of its digits is 21168, while the sum is 40.

The square root of 61719817 is about 7856.1960897116. The cubic root of 61719817 is about 395.1920595673.

The spelling of 61719817 in words is "sixty-one million, seven hundred nineteen thousand, eight hundred seventeen".