86938909 has 2 divisors, whose sum is σ = 86938910. Its totient is φ = 86938908.

The previous prime is 86938877. The next prime is 86938913. The reversal of 86938909 is 90983968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85932900 + 1006009 = 9270^2 + 1003^2 .

It is a cyclic number.

It is not a de Polignac number, because 86938909 - 2⁵ = 86938877 is a prime.

It is a super-2 number, since 2×86938909² = 15116747796220562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86938949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43469454 + 43469455.

It is an arithmetic number, because the mean of its divisors is an integer number (43469455).

Almost surely, 2^86938909 is an apocalyptic number.

It is an amenable number.

86938909 is a deficient number, since it is larger than the sum of its proper divisors (1).

86938909 is an equidigital number, since it uses as much as digits as its factorization.

86938909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 86938909 is about 9324.1036566525. The cubic root of 86938909 is about 443.0010225082.

The spelling of 86938909 in words is "eighty-six million, nine hundred thirty-eight thousand, nine hundred nine".