2171930149 has 8 divisors (see below), whose sum is σ = 2300536728. Its totient is φ = 2043417600.

The previous prime is 2171930143. The next prime is 2171930161. The reversal of 2171930149 is 9410391712.

It can be written as a sum of positive squares in 4 ways, for example, as 916999524 + 1254930625 = 30282^2 + 35425^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2171930149 - 2²¹ = 2169832997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171930143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27199 + ... + 71299.

It is an arithmetic number, because the mean of its divisors is an integer number (287567091).

Almost surely, 2^2171930149 is an apocalyptic number.

It is an amenable number.

2171930149 is a deficient number, since it is larger than the sum of its proper divisors (128606579).

2171930149 is a wasteful number, since it uses less digits than its factorization.

2171930149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47015.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 2171930149 is about 46603.9713865675. The cubic root of 2171930149 is about 1295.0363279961.

The spelling of 2171930149 in words is "two billion, one hundred seventy-one million, nine hundred thirty thousand, one hundred forty-nine".