86944909 has 2 divisors, whose sum is σ = 86944910. Its totient is φ = 86944908.

The previous prime is 86944861. The next prime is 86944933. The reversal of 86944909 is 90944968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59675625 + 27269284 = 7725^2 + 5222^2 .

It is a cyclic number.

It is not a de Polignac number, because 86944909 - 2⁹ = 86944397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86944939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43472454 + 43472455.

It is an arithmetic number, because the mean of its divisors is an integer number (43472455).

Almost surely, 2^86944909 is an apocalyptic number.

It is an amenable number.

86944909 is a deficient number, since it is larger than the sum of its proper divisors (1).

86944909 is an equidigital number, since it uses as much as digits as its factorization.

86944909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 86944909 is about 9324.4253978462. The cubic root of 86944909 is about 443.0112133614.

The spelling of 86944909 in words is "eighty-six million, nine hundred forty-four thousand, nine hundred nine".