2191351636 has 12 divisors (see below), whose sum is σ = 3848418112. Its totient is φ = 1091803608.

The previous prime is 2191351633. The next prime is 2191351699. The reversal of 2191351636 is 6361531912.

It is a happy number.

2191351636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 2191351595 and 2191351604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191351633) 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, 966780 + ... + 969043.

Almost surely, 2^2191351636 is an apocalyptic number.

It is an amenable number.

2191351636 is a deficient number, since it is larger than the sum of its proper divisors (1657066476).

2191351636 is a wasteful number, since it uses less digits than its factorization.

2191351636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936110 (or 1936108 counting only the distinct ones).

The product of its digits is 29160, while the sum is 37.

The square root of 2191351636 is about 46811.8749464279. The cubic root of 2191351636 is about 1298.8849681522.

The spelling of 2191351636 in words is "two billion, one hundred ninety-one million, three hundred fifty-one thousand, six hundred thirty-six".