87143477 has 2 divisors, whose sum is σ = 87143478. Its totient is φ = 87143476.

The previous prime is 87143461. The next prime is 87143533. The reversal of 87143477 is 77434178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46362481 + 40780996 = 6809^2 + 6386^2 .

It is a cyclic number.

It is not a de Polignac number, because 87143477 - 2⁴ = 87143461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87143417) 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, 43571738 + 43571739.

It is an arithmetic number, because the mean of its divisors is an integer number (43571739).

Almost surely, 2^87143477 is an apocalyptic number.

It is an amenable number.

87143477 is a deficient number, since it is larger than the sum of its proper divisors (1).

87143477 is an equidigital number, since it uses as much as digits as its factorization.

87143477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 131712, while the sum is 41.

The square root of 87143477 is about 9335.0670592128. The cubic root of 87143477 is about 443.3482120747.

The spelling of 87143477 in words is "eighty-seven million, one hundred forty-three thousand, four hundred seventy-seven".