87138883837 has 2 divisors, whose sum is σ = 87138883838. Its totient is φ = 87138883836.

The previous prime is 87138883771. The next prime is 87138883859. The reversal of 87138883837 is 73838883178.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79427585241 + 7711298596 = 281829^2 + 87814^2 .

It is a cyclic number.

It is not a de Polignac number, because 87138883837 - 2²⁷ = 87004666109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87138883877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43569441918 + 43569441919.

It is an arithmetic number, because the mean of its divisors is an integer number (43569441919).

Almost surely, 2^87138883837 is an apocalyptic number.

It is an amenable number.

87138883837 is a deficient number, since it is larger than the sum of its proper divisors (1).

87138883837 is an equidigital number, since it uses as much as digits as its factorization.

87138883837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43352064, while the sum is 64.

The spelling of 87138883837 in words is "eighty-seven billion, one hundred thirty-eight million, eight hundred eighty-three thousand, eight hundred thirty-seven".