85244381 has 2 divisors, whose sum is σ = 85244382. Its totient is φ = 85244380.

The previous prime is 85244359. The next prime is 85244387. The reversal of 85244381 is 18344258.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73376356 + 11868025 = 8566^2 + 3445^2 .

It is a cyclic number.

It is not a de Polignac number, because 85244381 - 2²⁶ = 18135517 is a prime.

It is a super-2 number, since 2×85244381² = 14533208984146322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85244387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42622190 + 42622191.

It is an arithmetic number, because the mean of its divisors is an integer number (42622191).

Almost surely, 2^85244381 is an apocalyptic number.

It is an amenable number.

85244381 is a deficient number, since it is larger than the sum of its proper divisors (1).

85244381 is an equidigital number, since it uses as much as digits as its factorization.

85244381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30720, while the sum is 35.

The square root of 85244381 is about 9232.7883653856. The cubic root of 85244381 is about 440.1039372228.

The spelling of 85244381 in words is "eighty-five million, two hundred forty-four thousand, three hundred eighty-one".