2642191817 has 4 divisors (see below), whose sum is σ = 2644044816. Its totient is φ = 2640338820.

The previous prime is 2642191801. The next prime is 2642191829. The reversal of 2642191817 is 7181912462.

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 2642191817 - 2⁴ = 2642191801 is a prime.

It is a super-2 number, since 2×2642191817² = 13962355195643522978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2642191897) 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, 924359 + ... + 927212.

It is an arithmetic number, because the mean of its divisors is an integer number (661011204).

Almost surely, 2^2642191817 is an apocalyptic number.

It is an amenable number.

2642191817 is a deficient number, since it is larger than the sum of its proper divisors (1852999).

2642191817 is a wasteful number, since it uses less digits than its factorization.

2642191817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852998.

The product of its digits is 48384, while the sum is 41.

The square root of 2642191817 is about 51402.2549797185. The cubic root of 2642191817 is about 1382.4670246226.

The spelling of 2642191817 in words is "two billion, six hundred forty-two million, one hundred ninety-one thousand, eight hundred seventeen".