1977940171 has 2 divisors, whose sum is σ = 1977940172. Its totient is φ = 1977940170.

The previous prime is 1977940141. The next prime is 1977940193. The reversal of 1977940171 is 1710497791.

It is a strong prime.

It is an emirp because it is prime and its reverse (1710497791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1977940171 - 2¹⁹ = 1977415883 is a prime.

It is not a weakly prime, because it can be changed into another prime (1977940141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 988970085 + 988970086.

It is an arithmetic number, because the mean of its divisors is an integer number (988970086).

Almost surely, 2^1977940171 is an apocalyptic number.

1977940171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1977940171 is an equidigital number, since it uses as much as digits as its factorization.

1977940171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 111132, while the sum is 46.

The square root of 1977940171 is about 44474.0392926031. The cubic root of 1977940171 is about 1255.2716397449.

The spelling of 1977940171 in words is "one billion, nine hundred seventy-seven million, nine hundred forty thousand, one hundred seventy-one".