87139497637 has 2 divisors, whose sum is σ = 87139497638. Its totient is φ = 87139497636.

The previous prime is 87139497629. The next prime is 87139497667. The reversal of 87139497637 is 73679493178.

It is a Cunningham number, because it is equal to 295194²+1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87139497636 + 1 = 295194^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 87139497637 - 2³ = 87139497629 is a prime.

It is a super-3 number, since 3×87139497637³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87139497667) 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, 43569748818 + 43569748819.

It is an arithmetic number, because the mean of its divisors is an integer number (43569748819).

Almost surely, 2^87139497637 is an apocalyptic number.

It is an amenable number.

87139497637 is a deficient number, since it is larger than the sum of its proper divisors (1).

87139497637 is an equidigital number, since it uses as much as digits as its factorization.

87139497637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48009024, while the sum is 64.

The spelling of 87139497637 in words is "eighty-seven billion, one hundred thirty-nine million, four hundred ninety-seven thousand, six hundred thirty-seven".