1977075641 has 2 divisors, whose sum is σ = 1977075642. Its totient is φ = 1977075640.

The previous prime is 1977075593. The next prime is 1977075671. The reversal of 1977075641 is 1465707791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1971804025 + 5271616 = 44405^2 + 2296^2 .

It is an emirp because it is prime and its reverse (1465707791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1977075641 - 2¹⁴ = 1977059257 is a prime.

It is not a weakly prime, because it can be changed into another prime (1977075671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 988537820 + 988537821.

It is an arithmetic number, because the mean of its divisors is an integer number (988537821).

Almost surely, 2^1977075641 is an apocalyptic number.

It is an amenable number.

1977075641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1977075641 is an equidigital number, since it uses as much as digits as its factorization.

1977075641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 370440, while the sum is 47.

The square root of 1977075641 is about 44464.3187398615. The cubic root of 1977075641 is about 1255.0887258636.

The spelling of 1977075641 in words is "one billion, nine hundred seventy-seven million, seventy-five thousand, six hundred forty-one".