87142224181 has 2 divisors, whose sum is σ = 87142224182. Its totient is φ = 87142224180.

The previous prime is 87142224161. The next prime is 87142224193. The reversal of 87142224181 is 18142224178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60779506225 + 26362717956 = 246535^2 + 162366^2 .

It is a cyclic number.

It is not a de Polignac number, because 87142224181 - 2⁷ = 87142224053 is a prime.

It is a super-2 number, since 2×87142224181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87142224121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43571112090 + 43571112091.

It is an arithmetic number, because the mean of its divisors is an integer number (43571112091).

Almost surely, 2^87142224181 is an apocalyptic number.

It is an amenable number.

87142224181 is a deficient number, since it is larger than the sum of its proper divisors (1).

87142224181 is an equidigital number, since it uses as much as digits as its factorization.

87142224181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57344, while the sum is 40.

The spelling of 87142224181 in words is "eighty-seven billion, one hundred forty-two million, two hundred twenty-four thousand, one hundred eighty-one".