85149521 has 2 divisors, whose sum is σ = 85149522. Its totient is φ = 85149520.

The previous prime is 85149499. The next prime is 85149527. The reversal of 85149521 is 12594158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45711121 + 39438400 = 6761^2 + 6280^2 .

It is a cyclic number.

It is not a de Polignac number, because 85149521 - 2¹⁴ = 85133137 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (85149527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42574760 + 42574761.

It is an arithmetic number, because the mean of its divisors is an integer number (42574761).

Almost surely, 2^85149521 is an apocalyptic number.

It is an amenable number.

85149521 is a deficient number, since it is larger than the sum of its proper divisors (1).

85149521 is an equidigital number, since it uses as much as digits as its factorization.

85149521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 35.

The square root of 85149521 is about 9227.6498091334. The cubic root of 85149521 is about 439.9406273193.

The spelling of 85149521 in words is "eighty-five million, one hundred forty-nine thousand, five hundred twenty-one".