2117719477 has 4 divisors (see below), whose sum is σ = 2117821216. Its totient is φ = 2117617740.

The previous prime is 2117719459. The next prime is 2117719481. The reversal of 2117719477 is 7749177112.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2117719477 - 2²³ = 2109330869 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 (2117716477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7083 + ... + 65464.

It is an arithmetic number, because the mean of its divisors is an integer number (529455304).

Almost surely, 2^2117719477 is an apocalyptic number.

It is an amenable number.

2117719477 is a deficient number, since it is larger than the sum of its proper divisors (101739).

2117719477 is an equidigital number, since it uses as much as digits as its factorization.

2117719477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101738.

The product of its digits is 172872, while the sum is 46.

The square root of 2117719477 is about 46018.6861720323. The cubic root of 2117719477 is about 1284.1708584740.

The spelling of 2117719477 in words is "two billion, one hundred seventeen million, seven hundred nineteen thousand, four hundred seventy-seven".