2191859716 has 12 divisors (see below), whose sum is σ = 3838080988. Its totient is φ = 1095265152.

The previous prime is 2191859689. The next prime is 2191859717. The reversal of 2191859716 is 6179581912.

It can be written as a sum of positive squares in 2 ways, for example, as 607819716 + 1584040000 = 24654^2 + 39800^2 .

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 2191859716.

It is not an unprimeable number, because it can be changed into a prime (2191859717) 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, 158721 + ... + 171976.

Almost surely, 2^2191859716 is an apocalyptic number.

It is an amenable number.

2191859716 is a deficient number, since it is larger than the sum of its proper divisors (1646221272).

2191859716 is a wasteful number, since it uses less digits than its factorization.

2191859716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332358 (or 332356 counting only the distinct ones).

The product of its digits is 272160, while the sum is 49.

The square root of 2191859716 is about 46817.3014600372. The cubic root of 2191859716 is about 1298.9853455429.

The spelling of 2191859716 in words is "two billion, one hundred ninety-one million, eight hundred fifty-nine thousand, seven hundred sixteen".