87133939649 has 2 divisors, whose sum is σ = 87133939650. Its totient is φ = 87133939648.

The previous prime is 87133939591. The next prime is 87133939663. The reversal of 87133939649 is 94693933178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79399968400 + 7733971249 = 281780^2 + 87943^2 .

It is a cyclic number.

It is not a de Polignac number, because 87133939649 - 2³² = 82838972353 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 87133939591 and 87133939600.

It is not a weakly prime, because it can be changed into another prime (87133939679) 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, 43566969824 + 43566969825.

It is an arithmetic number, because the mean of its divisors is an integer number (43566969825).

Almost surely, 2^87133939649 is an apocalyptic number.

It is an amenable number.

87133939649 is a deficient number, since it is larger than the sum of its proper divisors (1).

87133939649 is an equidigital number, since it uses as much as digits as its factorization.

87133939649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26453952, while the sum is 62.

The spelling of 87133939649 in words is "eighty-seven billion, one hundred thirty-three million, nine hundred thirty-nine thousand, six hundred forty-nine".