2091699456 has 432 divisors, whose sum is σ = 7337207808. Its totient is φ = 522547200.

The previous prime is 2091699437. The next prime is 2091699473. The reversal of 2091699456 is 6549961902.

It is a super-2 number, since 2×2091699456² = 8750413228461391872, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2091699399 and 2091699408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12832431 + ... + 12832593.

Almost surely, 2^2091699456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2091699456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3668603904).

2091699456 is an abundant number, since it is smaller than the sum of its proper divisors (5245508352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2091699456 is a wasteful number, since it uses less digits than its factorization.

2091699456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 51.

The square root of 2091699456 is about 45735.1009182225. The cubic root of 2091699456 is about 1278.8897142881.

The spelling of 2091699456 in words is "two billion, ninety-one million, six hundred ninety-nine thousand, four hundred fifty-six".