1977545987 has 2 divisors, whose sum is σ = 1977545988. Its totient is φ = 1977545986.

The previous prime is 1977545959. The next prime is 1977546019. The reversal of 1977545987 is 7895457791.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1977545987 - 2⁶ = 1977545923 is a prime.

It is not a weakly prime, because it can be changed into another prime (1977595987) 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, 988772993 + 988772994.

It is an arithmetic number, because the mean of its divisors is an integer number (988772994).

Almost surely, 2^1977545987 is an apocalyptic number.

1977545987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1977545987 is an equidigital number, since it uses as much as digits as its factorization.

1977545987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22226400, while the sum is 62.

The square root of 1977545987 is about 44469.6074527311. The cubic root of 1977545987 is about 1255.1882464456.

The spelling of 1977545987 in words is "one billion, nine hundred seventy-seven million, five hundred forty-five thousand, nine hundred eighty-seven".