2101600649 has 4 divisors (see below), whose sum is σ = 2101782420. Its totient is φ = 2101418880.

The previous prime is 2101600637. The next prime is 2101600693. The reversal of 2101600649 is 9460061012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70476025 + 2031124624 = 8395^2 + 45068^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101600649 - 2¹⁶ = 2101535113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101600549) 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, 72272 + ... + 97089.

It is an arithmetic number, because the mean of its divisors is an integer number (525445605).

Almost surely, 2^2101600649 is an apocalyptic number.

It is an amenable number.

2101600649 is a deficient number, since it is larger than the sum of its proper divisors (181771).

2101600649 is a wasteful number, since it uses less digits than its factorization.

2101600649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181770.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 2101600649 is about 45843.2181352924. The cubic root of 2101600649 is about 1280.9044407328.

The spelling of 2101600649 in words is "two billion, one hundred one million, six hundred thousand, six hundred forty-nine".