87143561 has 2 divisors, whose sum is σ = 87143562. Its totient is φ = 87143560.

The previous prime is 87143543. The next prime is 87143587. The reversal of 87143561 is 16534178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60155536 + 26988025 = 7756^2 + 5195^2 .

It is a cyclic number.

It is not a de Polignac number, because 87143561 - 2²² = 82949257 is a prime.

It is not a weakly prime, because it can be changed into another prime (87143461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43571780 + 43571781.

It is an arithmetic number, because the mean of its divisors is an integer number (43571781).

Almost surely, 2^87143561 is an apocalyptic number.

It is an amenable number.

87143561 is a deficient number, since it is larger than the sum of its proper divisors (1).

87143561 is an equidigital number, since it uses as much as digits as its factorization.

87143561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 35.

The square root of 87143561 is about 9335.0715583760. The cubic root of 87143561 is about 443.3483545265.

The spelling of 87143561 in words is "eighty-seven million, one hundred forty-three thousand, five hundred sixty-one".