86731969 has 9 divisors (see below), whose sum is σ = 88683777. Its totient is φ = 84822804.

The previous prime is 86731963. The next prime is 86732027. The reversal of 86731969 is 96913768.

The square root of 86731969 is 9313.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 86731969 - 2⁵ = 86731937 is a prime.

It is a super-2 number, since 2×86731969² = 15044868893233922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86731963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 623902 + ... + 624040.

It is an arithmetic number, because the mean of its divisors is an integer number (9853753).

Almost surely, 2^86731969 is an apocalyptic number.

86731969 is the 9313-rd square number.

86731969 is the 4657-th centered octagonal number.

It is an amenable number.

86731969 is a deficient number, since it is larger than the sum of its proper divisors (1951808).

86731969 is an frugal number, since it uses more digits than its factorization.

86731969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412 (or 206 counting only the distinct ones).

The product of its digits is 489888, while the sum is 49.

The cubic root of 86731969 is about 442.6492526410.

Multiplying 86731969 by its sum of digits (49), we get a square (4249866481 = 65191²).

The spelling of 86731969 in words is "eighty-six million, seven hundred thirty-one thousand, nine hundred sixty-nine".