1987520047 has 2 divisors, whose sum is σ = 1987520048. Its totient is φ = 1987520046.

The previous prime is 1987520027. The next prime is 1987520063. The reversal of 1987520047 is 7400257891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1987520047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1987519985 and 1987520012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1987520027) 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, 993760023 + 993760024.

It is an arithmetic number, because the mean of its divisors is an integer number (993760024).

Almost surely, 2^1987520047 is an apocalyptic number.

1987520047 is a deficient number, since it is larger than the sum of its proper divisors (1).

1987520047 is an equidigital number, since it uses as much as digits as its factorization.

1987520047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 43.

The square root of 1987520047 is about 44581.6110857380. The cubic root of 1987520047 is about 1257.2949541238.

The spelling of 1987520047 in words is "one billion, nine hundred eighty-seven million, five hundred twenty thousand, forty-seven".