2171513149 has 4 divisors (see below), whose sum is σ = 2338552636. Its totient is φ = 2004473664.

The previous prime is 2171513111. The next prime is 2171513159. The reversal of 2171513149 is 9413151712.

It is a happy number.

2171513149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 858900249 + 1312612900 = 29307^2 + 36230^2 .

It is a cyclic number.

It is not a de Polignac number, because 2171513149 - 2¹¹ = 2171511101 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 (2171513159) 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, 83519724 + ... + 83519749.

It is an arithmetic number, because the mean of its divisors is an integer number (584638159).

Almost surely, 2^2171513149 is an apocalyptic number.

It is an amenable number.

2171513149 is a deficient number, since it is larger than the sum of its proper divisors (167039487).

2171513149 is a wasteful number, since it uses less digits than its factorization.

2171513149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167039486.

The product of its digits is 7560, while the sum is 34.

The square root of 2171513149 is about 46599.4973041555. The cubic root of 2171513149 is about 1294.9534424708.

The spelling of 2171513149 in words is "two billion, one hundred seventy-one million, five hundred thirteen thousand, one hundred forty-nine".