87931309633 has 2 divisors, whose sum is σ = 87931309634. Its totient is φ = 87931309632.

The previous prime is 87931309603. The next prime is 87931309681. The reversal of 87931309633 is 33690313978.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82178542224 + 5752767409 = 286668^2 + 75847^2 .

It is a cyclic number.

It is not a de Polignac number, because 87931309633 - 2³³ = 79341375041 is a prime.

It is not a weakly prime, because it can be changed into another prime (87931309603) 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, 43965654816 + 43965654817.

It is an arithmetic number, because the mean of its divisors is an integer number (43965654817).

Almost surely, 2^87931309633 is an apocalyptic number.

It is an amenable number.

87931309633 is a deficient number, since it is larger than the sum of its proper divisors (1).

87931309633 is an equidigital number, since it uses as much as digits as its factorization.

87931309633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2204496, while the sum is 52.

The spelling of 87931309633 in words is "eighty-seven billion, nine hundred thirty-one million, three hundred nine thousand, six hundred thirty-three".