2171145977 has 96 divisors (see below), whose sum is σ = 3144298752. Its totient is φ = 1446336000.

The previous prime is 2171145947. The next prime is 2171145983. The reversal of 2171145977 is 7795411712.

It is not a de Polignac number, because 2171145977 - 2¹⁴ = 2171129593 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171145917) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 35592527 + ... + 35592587.

It is an arithmetic number, because the mean of its divisors is an integer number (32753112).

Almost surely, 2^2171145977 is an apocalyptic number.

It is an amenable number.

2171145977 is a deficient number, since it is larger than the sum of its proper divisors (973152775).

2171145977 is a wasteful number, since it uses less digits than its factorization.

2171145977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 160 counting only the distinct ones).

The product of its digits is 123480, while the sum is 44.

The square root of 2171145977 is about 46595.5574813737. The cubic root of 2171145977 is about 1294.8804522848.

The spelling of 2171145977 in words is "two billion, one hundred seventy-one million, one hundred forty-five thousand, nine hundred seventy-seven".