87436680109 has 2 divisors, whose sum is σ = 87436680110. Its totient is φ = 87436680108.

The previous prime is 87436680083. The next prime is 87436680167. The reversal of 87436680109 is 90108663478.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78892450884 + 8544229225 = 280878^2 + 92435^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87436680109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87436680169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43718340054 + 43718340055.

It is an arithmetic number, because the mean of its divisors is an integer number (43718340055).

Almost surely, 2^87436680109 is an apocalyptic number.

It is an amenable number.

87436680109 is a deficient number, since it is larger than the sum of its proper divisors (1).

87436680109 is an equidigital number, since it uses as much as digits as its factorization.

87436680109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 87436680109 in words is "eighty-seven billion, four hundred thirty-six million, six hundred eighty thousand, one hundred nine".