85389431 has 2 divisors, whose sum is σ = 85389432. Its totient is φ = 85389430.

The previous prime is 85389389. The next prime is 85389449. The reversal of 85389431 is 13498358.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85389431 - 2¹⁴ = 85373047 is a prime.

It is a super-2 number, since 2×85389431² = 14582709853007522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85389131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42694715 + 42694716.

It is an arithmetic number, because the mean of its divisors is an integer number (42694716).

Almost surely, 2^85389431 is an apocalyptic number.

85389431 is a deficient number, since it is larger than the sum of its proper divisors (1).

85389431 is an equidigital number, since it uses as much as digits as its factorization.

85389431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The square root of 85389431 is about 9240.6401834505. The cubic root of 85389431 is about 440.3534195605.

The spelling of 85389431 in words is "eighty-five million, three hundred eighty-nine thousand, four hundred thirty-one".