86923981 has 2 divisors, whose sum is σ = 86923982. Its totient is φ = 86923980.

The previous prime is 86923973. The next prime is 86923987. The reversal of 86923981 is 18932968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61873956 + 25050025 = 7866^2 + 5005^2 .

It is a cyclic number.

It is not a de Polignac number, because 86923981 - 2³ = 86923973 is a prime.

It is a super-2 number, since 2×86923981² = 15111556945776722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86923987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43461990 + 43461991.

It is an arithmetic number, because the mean of its divisors is an integer number (43461991).

Almost surely, 2^86923981 is an apocalyptic number.

It is an amenable number.

86923981 is a deficient number, since it is larger than the sum of its proper divisors (1).

86923981 is an equidigital number, since it uses as much as digits as its factorization.

86923981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 46.

The square root of 86923981 is about 9323.3031163853. The cubic root of 86923981 is about 442.9756656306.

The spelling of 86923981 in words is "eighty-six million, nine hundred twenty-three thousand, nine hundred eighty-one".