85390691 has 2 divisors, whose sum is σ = 85390692. Its totient is φ = 85390690.

The previous prime is 85390621. The next prime is 85390699. The reversal of 85390691 is 19609358.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85390691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85390699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42695345 + 42695346.

It is an arithmetic number, because the mean of its divisors is an integer number (42695346).

Almost surely, 2^85390691 is an apocalyptic number.

85390691 is a deficient number, since it is larger than the sum of its proper divisors (1).

85390691 is an equidigital number, since it uses as much as digits as its factorization.

85390691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 85390691 is about 9240.7083602936. The cubic root of 85390691 is about 440.3555854905.

The spelling of 85390691 in words is "eighty-five million, three hundred ninety thousand, six hundred ninety-one".