1987584761 has 2 divisors, whose sum is σ = 1987584762. Its totient is φ = 1987584760.

The previous prime is 1987584751. The next prime is 1987584791. The reversal of 1987584761 is 1674857891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1978470400 + 9114361 = 44480^2 + 3019^2 .

It is a cyclic number.

It is not a de Polignac number, because 1987584761 - 2¹⁰ = 1987583737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1987584697 and 1987584706.

It is not a weakly prime, because it can be changed into another prime (1987584751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993792380 + 993792381.

It is an arithmetic number, because the mean of its divisors is an integer number (993792381).

Almost surely, 2^1987584761 is an apocalyptic number.

It is an amenable number.

1987584761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1987584761 is an equidigital number, since it uses as much as digits as its factorization.

1987584761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 56.

The square root of 1987584761 is about 44582.3368723534. The cubic root of 1987584761 is about 1257.3085998902.

The spelling of 1987584761 in words is "one billion, nine hundred eighty-seven million, five hundred eighty-four thousand, seven hundred sixty-one".