87511811 has 2 divisors, whose sum is σ = 87511812. Its totient is φ = 87511810.

The previous prime is 87511793. The next prime is 87511813. The reversal of 87511811 is 11811578.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87511811 - 2⁶ = 87511747 is a prime.

It is a Sophie Germain prime.

Together with 87511813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87511813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43755905 + 43755906.

It is an arithmetic number, because the mean of its divisors is an integer number (43755906).

Almost surely, 2^87511811 is an apocalyptic number.

87511811 is a deficient number, since it is larger than the sum of its proper divisors (1).

87511811 is an equidigital number, since it uses as much as digits as its factorization.

87511811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240, while the sum is 32.

The square root of 87511811 is about 9354.7747701374. The cubic root of 87511811 is about 443.9719752758.

The spelling of 87511811 in words is "eighty-seven million, five hundred eleven thousand, eight hundred eleven".