86481961 has 2 divisors, whose sum is σ = 86481962. Its totient is φ = 86481960.

The previous prime is 86481959. The next prime is 86481991. The reversal of 86481961 is 16918468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78216336 + 8265625 = 8844^2 + 2875^2 .

It is a cyclic number.

It is not a de Polignac number, because 86481961 - 2¹ = 86481959 is a prime.

Together with 86481959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (86481991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43240980 + 43240981.

It is an arithmetic number, because the mean of its divisors is an integer number (43240981).

Almost surely, 2^86481961 is an apocalyptic number.

It is an amenable number.

86481961 is a deficient number, since it is larger than the sum of its proper divisors (1).

86481961 is an equidigital number, since it uses as much as digits as its factorization.

86481961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 43.

The square root of 86481961 is about 9299.5677856554. The cubic root of 86481961 is about 442.2235258915.

It can be divided in two parts, 8648 and 1961, that added together give a square (10609 = 103²).

The spelling of 86481961 in words is "eighty-six million, four hundred eighty-one thousand, nine hundred sixty-one".