86999947 has 2 divisors, whose sum is σ = 86999948. Its totient is φ = 86999946.

The previous prime is 86999929. The next prime is 86999951. The reversal of 86999947 is 74999968.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86999947 - 2¹¹ = 86997899 is a prime.

It is not a weakly prime, because it can be changed into another prime (86999747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43499973 + 43499974.

It is an arithmetic number, because the mean of its divisors is an integer number (43499974).

Almost surely, 2^86999947 is an apocalyptic number.

86999947 is a deficient number, since it is larger than the sum of its proper divisors (1).

86999947 is an equidigital number, since it uses as much as digits as its factorization.

86999947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8817984, while the sum is 61.

The square root of 86999947 is about 9327.3762119902. The cubic root of 86999947 is about 443.1046721902.

The spelling of 86999947 in words is "eighty-six million, nine hundred ninety-nine thousand, nine hundred forty-seven".