86581973 has 2 divisors, whose sum is σ = 86581974. Its totient is φ = 86581972.

The previous prime is 86581949. The next prime is 86581991. The reversal of 86581973 is 37918568.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50665924 + 35916049 = 7118^2 + 5993^2 .

It is a cyclic number.

It is not a de Polignac number, because 86581973 - 2⁸ = 86581717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86581933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43290986 + 43290987.

It is an arithmetic number, because the mean of its divisors is an integer number (43290987).

Almost surely, 2^86581973 is an apocalyptic number.

It is an amenable number.

86581973 is a deficient number, since it is larger than the sum of its proper divisors (1).

86581973 is an equidigital number, since it uses as much as digits as its factorization.

86581973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The square root of 86581973 is about 9304.9434710803. The cubic root of 86581973 is about 442.3939299106.

The spelling of 86581973 in words is "eighty-six million, five hundred eighty-one thousand, nine hundred seventy-three".