86752781 has 2 divisors, whose sum is σ = 86752782. Its totient is φ = 86752780.

The previous prime is 86752759. The next prime is 86752789. The reversal of 86752781 is 18725768.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85562500 + 1190281 = 9250^2 + 1091^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86752781 is a prime.

It is a super-2 number, since 2×86752781² = 15052090022467922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86752789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43376390 + 43376391.

It is an arithmetic number, because the mean of its divisors is an integer number (43376391).

Almost surely, 2^86752781 is an apocalyptic number.

It is an amenable number.

86752781 is a deficient number, since it is larger than the sum of its proper divisors (1).

86752781 is an equidigital number, since it uses as much as digits as its factorization.

86752781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 44.

The square root of 86752781 is about 9314.1172958043. The cubic root of 86752781 is about 442.6846555018.

The spelling of 86752781 in words is "eighty-six million, seven hundred fifty-two thousand, seven hundred eighty-one".