87222661 has 2 divisors, whose sum is σ = 87222662. Its totient is φ = 87222660.

The previous prime is 87222643. The next prime is 87222697. The reversal of 87222661 is 16622278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64240225 + 22982436 = 8015^2 + 4794^2 .

It is a cyclic number.

It is not a de Polignac number, because 87222661 - 2¹¹ = 87220613 is a prime.

It is equal to p_5065378 and since 87222661 and 5065378 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87282661) 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, 43611330 + 43611331.

It is an arithmetic number, because the mean of its divisors is an integer number (43611331).

Almost surely, 2^87222661 is an apocalyptic number.

It is an amenable number.

87222661 is a deficient number, since it is larger than the sum of its proper divisors (1).

87222661 is an equidigital number, since it uses as much as digits as its factorization.

87222661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 34.

The square root of 87222661 is about 9339.3073083607. The cubic root of 87222661 is about 443.4824560373.

The spelling of 87222661 in words is "eighty-seven million, two hundred twenty-two thousand, six hundred sixty-one".