1987554773 has 2 divisors, whose sum is σ = 1987554774. Its totient is φ = 1987554772.

The previous prime is 1987554733. The next prime is 1987554787. The reversal of 1987554773 is 3774557891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1987554724 + 49 = 44582^2 + 7^2 .

It is a cyclic number.

It is not a de Polignac number, because 1987554773 - 2¹⁰ = 1987553749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1987554713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993777386 + 993777387.

It is an arithmetic number, because the mean of its divisors is an integer number (993777387).

Almost surely, 2^1987554773 is an apocalyptic number.

It is an amenable number.

1987554773 is a deficient number, since it is larger than the sum of its proper divisors (1).

1987554773 is an equidigital number, since it uses as much as digits as its factorization.

1987554773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7408800, while the sum is 56.

The square root of 1987554773 is about 44582.0005495491. Note that the first 3 decimals coincide. The cubic root of 1987554773 is about 1257.3022765775.

The spelling of 1987554773 in words is "one billion, nine hundred eighty-seven million, five hundred fifty-four thousand, seven hundred seventy-three".