2117549749 has 12 divisors (see below), whose sum is σ = 2520560064. Its totient is φ = 1772830584.

The previous prime is 2117549747. The next prime is 2117549761. The reversal of 2117549749 is 9479457112.

It is not a de Polignac number, because 2117549749 - 2¹ = 2117549747 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117549743) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 500397 + ... + 504610.

It is an arithmetic number, because the mean of its divisors is an integer number (210046672).

Almost surely, 2^2117549749 is an apocalyptic number.

It is an amenable number.

2117549749 is a deficient number, since it is larger than the sum of its proper divisors (403010315).

2117549749 is a wasteful number, since it uses less digits than its factorization.

2117549749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005064 (or 1005057 counting only the distinct ones).

The product of its digits is 635040, while the sum is 49.

The square root of 2117549749 is about 46016.8420146363. The cubic root of 2117549749 is about 1284.1365502513.

The spelling of 2117549749 in words is "two billion, one hundred seventeen million, five hundred forty-nine thousand, seven hundred forty-nine".