86950781 has 2 divisors, whose sum is σ = 86950782. Its totient is φ = 86950780.

The previous prime is 86950757. The next prime is 86950807. The reversal of 86950781 is 18705968.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85858756 + 1092025 = 9266^2 + 1045^2 .

It is a cyclic number.

It is not a de Polignac number, because 86950781 - 2²² = 82756477 is a prime.

It is a super-2 number, since 2×86950781² = 15120876633019922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86950751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43475390 + 43475391.

It is an arithmetic number, because the mean of its divisors is an integer number (43475391).

Almost surely, 2^86950781 is an apocalyptic number.

It is an amenable number.

86950781 is a deficient number, since it is larger than the sum of its proper divisors (1).

86950781 is an equidigital number, since it uses as much as digits as its factorization.

86950781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 86950781 is about 9324.7402644792. The cubic root of 86950781 is about 443.0211863559.

The spelling of 86950781 in words is "eighty-six million, nine hundred fifty thousand, seven hundred eighty-one".