85733231 has 2 divisors, whose sum is σ = 85733232. Its totient is φ = 85733230.

The previous prime is 85733209. The next prime is 85733233. The reversal of 85733231 is 13233758.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85733231 - 2²² = 81538927 is a prime.

It is a super-2 number, since 2×85733231² = 14700373795398722, which contains 22 as substring.

Together with 85733233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85733233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42866615 + 42866616.

It is an arithmetic number, because the mean of its divisors is an integer number (42866616).

Almost surely, 2^85733231 is an apocalyptic number.

85733231 is a deficient number, since it is larger than the sum of its proper divisors (1).

85733231 is an equidigital number, since it uses as much as digits as its factorization.

85733231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 32.

The square root of 85733231 is about 9259.2241035629. The cubic root of 85733231 is about 440.9436205333.

Adding to 85733231 its reverse (13233758), we get a palindrome (98966989).

The spelling of 85733231 in words is "eighty-five million, seven hundred thirty-three thousand, two hundred thirty-one".