61719871 has 4 divisors (see below), whose sum is σ = 61820200. Its totient is φ = 61619544.

The previous prime is 61719829. The next prime is 61719887. The reversal of 61719871 is 17891716.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61719871 - 2¹¹ = 61717823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61759871) 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 3 ways as a sum of consecutive naturals, for example, 49236 + ... + 50473.

It is an arithmetic number, because the mean of its divisors is an integer number (15455050).

Almost surely, 2^61719871 is an apocalyptic number.

61719871 is a deficient number, since it is larger than the sum of its proper divisors (100329).

61719871 is an equidigital number, since it uses as much as digits as its factorization.

61719871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100328.

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

The square root of 61719871 is about 7856.1995264886. The cubic root of 61719871 is about 395.1921748213.

The spelling of 61719871 in words is "sixty-one million, seven hundred nineteen thousand, eight hundred seventy-one".