87667109 has 2 divisors, whose sum is σ = 87667110. Its totient is φ = 87667108.

The previous prime is 87667093. The next prime is 87667117. The reversal of 87667109 is 90176678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47914084 + 39753025 = 6922^2 + 6305^2 .

It is a cyclic number.

It is not a de Polignac number, because 87667109 - 2⁴ = 87667093 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 87667109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87667199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43833554 + 43833555.

It is an arithmetic number, because the mean of its divisors is an integer number (43833555).

Almost surely, 2^87667109 is an apocalyptic number.

It is an amenable number.

87667109 is a deficient number, since it is larger than the sum of its proper divisors (1).

87667109 is an equidigital number, since it uses as much as digits as its factorization.

87667109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 87667109 is about 9363.0715579878. The cubic root of 87667109 is about 444.2344435236.

The spelling of 87667109 in words is "eighty-seven million, six hundred sixty-seven thousand, one hundred nine".