85982921 has 2 divisors, whose sum is σ = 85982922. Its totient is φ = 85982920.

The previous prime is 85982899. The next prime is 85982927. The reversal of 85982921 is 12928958.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74149321 + 11833600 = 8611^2 + 3440^2 .

It is a cyclic number.

It is not a de Polignac number, because 85982921 - 2¹⁸ = 85720777 is a prime.

It is not a weakly prime, because it can be changed into another prime (85982927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42991460 + 42991461.

It is an arithmetic number, because the mean of its divisors is an integer number (42991461).

Almost surely, 2^85982921 is an apocalyptic number.

It is an amenable number.

85982921 is a deficient number, since it is larger than the sum of its proper divisors (1).

85982921 is an equidigital number, since it uses as much as digits as its factorization.

85982921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 44.

The square root of 85982921 is about 9272.6976118064. The cubic root of 85982921 is about 441.3712746234.

The spelling of 85982921 in words is "eighty-five million, nine hundred eighty-two thousand, nine hundred twenty-one".