87811475281 has 2 divisors, whose sum is σ = 87811475282. Its totient is φ = 87811475280.

The previous prime is 87811475237. The next prime is 87811475287. The reversal of 87811475281 is 18257411878.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55065315600 + 32746159681 = 234660^2 + 180959^2 .

It is a cyclic number.

It is not a de Polignac number, because 87811475281 - 2²³ = 87803086673 is a prime.

It is a super-2 number, since 2×87811475281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87811475287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43905737640 + 43905737641.

It is an arithmetic number, because the mean of its divisors is an integer number (43905737641).

Almost surely, 2^87811475281 is an apocalyptic number.

It is an amenable number.

87811475281 is a deficient number, since it is larger than the sum of its proper divisors (1).

87811475281 is an equidigital number, since it uses as much as digits as its factorization.

87811475281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1003520, while the sum is 52.

The spelling of 87811475281 in words is "eighty-seven billion, eight hundred eleven million, four hundred seventy-five thousand, two hundred eighty-one".