87134128619 has 2 divisors, whose sum is σ = 87134128620. Its totient is φ = 87134128618.

The previous prime is 87134128597. The next prime is 87134128651. The reversal of 87134128619 is 91682143178.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87134128619 is a prime.

It is a super-2 number, since 2×87134128619² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (87134128019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43567064309 + 43567064310.

It is an arithmetic number, because the mean of its divisors is an integer number (43567064310).

Almost surely, 2^87134128619 is an apocalyptic number.

87134128619 is a deficient number, since it is larger than the sum of its proper divisors (1).

87134128619 is an equidigital number, since it uses as much as digits as its factorization.

87134128619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 50.

The spelling of 87134128619 in words is "eighty-seven billion, one hundred thirty-four million, one hundred twenty-eight thousand, six hundred nineteen".