87765911 has 2 divisors, whose sum is σ = 87765912. Its totient is φ = 87765910.

The previous prime is 87765893. The next prime is 87765947. The reversal of 87765911 is 11956778.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87765911 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87762911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43882955 + 43882956.

It is an arithmetic number, because the mean of its divisors is an integer number (43882956).

Almost surely, 2^87765911 is an apocalyptic number.

87765911 is a deficient number, since it is larger than the sum of its proper divisors (1).

87765911 is an equidigital number, since it uses as much as digits as its factorization.

87765911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 44.

The square root of 87765911 is about 9368.3462254552. The cubic root of 87765911 is about 444.4012669143.

The spelling of 87765911 in words is "eighty-seven million, seven hundred sixty-five thousand, nine hundred eleven".