85491961 has 2 divisors, whose sum is σ = 85491962. Its totient is φ = 85491960.

The previous prime is 85491949. The next prime is 85492009. The reversal of 85491961 is 16919458.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71571600 + 13920361 = 8460^2 + 3731^2 .

It is a cyclic number.

It is not a de Polignac number, because 85491961 - 2¹¹ = 85489913 is a prime.

It is not a weakly prime, because it can be changed into another prime (85491061) 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, 42745980 + 42745981.

It is an arithmetic number, because the mean of its divisors is an integer number (42745981).

Almost surely, 2^85491961 is an apocalyptic number.

It is an amenable number.

85491961 is a deficient number, since it is larger than the sum of its proper divisors (1).

85491961 is an equidigital number, since it uses as much as digits as its factorization.

85491961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 43.

The square root of 85491961 is about 9246.1862949002. The cubic root of 85491961 is about 440.5295981843.

The spelling of 85491961 in words is "eighty-five million, four hundred ninety-one thousand, nine hundred sixty-one".