86143961 has 2 divisors, whose sum is σ = 86143962. Its totient is φ = 86143960.

The previous prime is 86143951. The next prime is 86144021. The reversal of 86143961 is 16934168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86025625 + 118336 = 9275^2 + 344^2 .

It is a cyclic number.

It is not a de Polignac number, because 86143961 - 2¹⁰ = 86142937 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (86143931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43071980 + 43071981.

It is an arithmetic number, because the mean of its divisors is an integer number (43071981).

Almost surely, 2^86143961 is an apocalyptic number.

It is an amenable number.

86143961 is a deficient number, since it is larger than the sum of its proper divisors (1).

86143961 is an equidigital number, since it uses as much as digits as its factorization.

86143961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 86143961 is about 9281.3771068737. The cubic root of 86143961 is about 441.6466552857.

The spelling of 86143961 in words is "eighty-six million, one hundred forty-three thousand, nine hundred sixty-one".