2109171549 has 16 divisors (see below), whose sum is σ = 2829094400. Its totient is φ = 1397707056.

The previous prime is 2109171541. The next prime is 2109171557. The reversal of 2109171549 is 9451719012.

It is an interprime number because it is at equal distance from previous prime (2109171541) and next prime (2109171557).

It is not a de Polignac number, because 2109171549 - 2³ = 2109171541 is a prime.

It is a super-2 number, since 2×2109171549² = 8897209246222118802, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2109171541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 369882 + ... + 375540.

It is an arithmetic number, because the mean of its divisors is an integer number (176818400).

Almost surely, 2^2109171549 is an apocalyptic number.

It is an amenable number.

2109171549 is a deficient number, since it is larger than the sum of its proper divisors (719922851).

2109171549 is a wasteful number, since it uses less digits than its factorization.

2109171549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6384.

The product of its (nonzero) digits is 22680, while the sum is 39.

The square root of 2109171549 is about 45925.7177298298. The cubic root of 2109171549 is about 1282.4407265258.

The spelling of 2109171549 in words is "two billion, one hundred nine million, one hundred seventy-one thousand, five hundred forty-nine".