87557881 has 2 divisors, whose sum is σ = 87557882. Its totient is φ = 87557880.

The previous prime is 87557867. The next prime is 87557927. The reversal of 87557881 is 18875578.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83557881 + 4000000 = 9141^2 + 2000^2 .

It is a cyclic number.

It is not a de Polignac number, because 87557881 - 2¹¹ = 87555833 is a prime.

It is a super-2 number, since 2×87557881² = 15332765050420322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87557861) 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, 43778940 + 43778941.

It is an arithmetic number, because the mean of its divisors is an integer number (43778941).

Almost surely, 2^87557881 is an apocalyptic number.

It is an amenable number.

87557881 is a deficient number, since it is larger than the sum of its proper divisors (1).

87557881 is an equidigital number, since it uses as much as digits as its factorization.

87557881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 627200, while the sum is 49.

The square root of 87557881 is about 9357.2368250462. The cubic root of 87557881 is about 444.0498702877.

The spelling of 87557881 in words is "eighty-seven million, five hundred fifty-seven thousand, eight hundred eighty-one".