85225991 has 2 divisors, whose sum is σ = 85225992. Its totient is φ = 85225990.

The previous prime is 85225979. The next prime is 85225997. The reversal of 85225991 is 19952258.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85225991 - 2⁶ = 85225927 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 (85225997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42612995 + 42612996.

It is an arithmetic number, because the mean of its divisors is an integer number (42612996).

Almost surely, 2^85225991 is an apocalyptic number.

85225991 is a deficient number, since it is larger than the sum of its proper divisors (1).

85225991 is an equidigital number, since it uses as much as digits as its factorization.

85225991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 41.

The square root of 85225991 is about 9231.7924045117. The cubic root of 85225991 is about 440.0722866772.

The spelling of 85225991 in words is "eighty-five million, two hundred twenty-five thousand, nine hundred ninety-one".