86259781 has 2 divisors, whose sum is σ = 86259782. Its totient is φ = 86259780.

The previous prime is 86259709. The next prime is 86259787. The reversal of 86259781 is 18795268.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57002500 + 29257281 = 7550^2 + 5409^2 .

It is a cyclic number.

It is not a de Polignac number, because 86259781 - 2⁷ = 86259653 is a prime.

It is a super-2 number, since 2×86259781² = 14881499636335922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86259787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43129890 + 43129891.

It is an arithmetic number, because the mean of its divisors is an integer number (43129891).

Almost surely, 2^86259781 is an apocalyptic number.

It is an amenable number.

86259781 is a deficient number, since it is larger than the sum of its proper divisors (1).

86259781 is an equidigital number, since it uses as much as digits as its factorization.

86259781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 46.

The square root of 86259781 is about 9287.6143869134. The cubic root of 86259781 is about 441.8444970065.

The spelling of 86259781 in words is "eighty-six million, two hundred fifty-nine thousand, seven hundred eighty-one".