87903281 has 2 divisors, whose sum is σ = 87903282. Its totient is φ = 87903280.

The previous prime is 87903271. The next prime is 87903313. The reversal of 87903281 is 18230978.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84805681 + 3097600 = 9209^2 + 1760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87903281 is a prime.

It is a super-2 number, since 2×87903281² = 15453973621129922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87903251) 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, 43951640 + 43951641.

It is an arithmetic number, because the mean of its divisors is an integer number (43951641).

Almost surely, 2^87903281 is an apocalyptic number.

It is an amenable number.

87903281 is a deficient number, since it is larger than the sum of its proper divisors (1).

87903281 is an equidigital number, since it uses as much as digits as its factorization.

87903281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 87903281 is about 9375.6749623694. The cubic root of 87903281 is about 444.6330029753.

The spelling of 87903281 in words is "eighty-seven million, nine hundred three thousand, two hundred eighty-one".