7987681531 has 2 divisors, whose sum is σ = 7987681532. Its totient is φ = 7987681530.

The previous prime is 7987681517. The next prime is 7987681573. The reversal of 7987681531 is 1351867897.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7987681531 - 2²¹ = 7985584379 is a prime.

It is a super-2 number, since 2×7987681531² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7987682531) 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, 3993840765 + 3993840766.

It is an arithmetic number, because the mean of its divisors is an integer number (3993840766).

Almost surely, 2^7987681531 is an apocalyptic number.

7987681531 is a deficient number, since it is larger than the sum of its proper divisors (1).

7987681531 is an equidigital number, since it uses as much as digits as its factorization.

7987681531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 55.

The square root of 7987681531 is about 89373.8302357015. The cubic root of 7987681531 is about 1998.9729335742.

The spelling of 7987681531 in words is "seven billion, nine hundred eighty-seven million, six hundred eighty-one thousand, five hundred thirty-one".