87777331 has 2 divisors, whose sum is σ = 87777332. Its totient is φ = 87777330.

The previous prime is 87777329. The next prime is 87777413. The reversal of 87777331 is 13377778.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87777331 - 2¹ = 87777329 is a prime.

It is a super-2 number, since 2×87777331² = 15409719674967122, which contains 22 as substring.

Together with 87777329, it forms a pair of twin primes.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (87777301) 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, 43888665 + 43888666.

It is an arithmetic number, because the mean of its divisors is an integer number (43888666).

Almost surely, 2^87777331 is an apocalyptic number.

87777331 is a deficient number, since it is larger than the sum of its proper divisors (1).

87777331 is an equidigital number, since it uses as much as digits as its factorization.

87777331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172872, while the sum is 43.

The square root of 87777331 is about 9368.9557048798. The cubic root of 87777331 is about 444.4205410732.

The spelling of 87777331 in words is "eighty-seven million, seven hundred seventy-seven thousand, three hundred thirty-one".