87557819 has 2 divisors, whose sum is σ = 87557820. Its totient is φ = 87557818.

The previous prime is 87557807. The next prime is 87557861. The reversal of 87557819 is 91875578.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87557819 - 2⁸ = 87557563 is a prime.

It is a super-2 number, since 2×87557819² = 15332743336073522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87557419) 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, 43778909 + 43778910.

It is an arithmetic number, because the mean of its divisors is an integer number (43778910).

Almost surely, 2^87557819 is an apocalyptic number.

87557819 is a deficient number, since it is larger than the sum of its proper divisors (1).

87557819 is an equidigital number, since it uses as much as digits as its factorization.

87557819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 705600, while the sum is 50.

The square root of 87557819 is about 9357.2335121017. The cubic root of 87557819 is about 444.0497654767.

The spelling of 87557819 in words is "eighty-seven million, five hundred fifty-seven thousand, eight hundred nineteen".