81486365 has 8 divisors (see below), whose sum is σ = 97846488. Its totient is φ = 65147200.

The previous prime is 81486359. The next prime is 81486371. The reversal of 81486365 is 56368418.

It is an interprime number because it is at equal distance from previous prime (81486359) and next prime (81486371).

It can be written as a sum of positive squares in 4 ways, for example, as 17689 + 81468676 = 133^2 + 9026^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81486365 - 2¹⁴ = 81469981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5219 + ... + 13791.

It is an arithmetic number, because the mean of its divisors is an integer number (12230811).

Almost surely, 2^81486365 is an apocalyptic number.

It is an amenable number.

81486365 is a deficient number, since it is larger than the sum of its proper divisors (16360123).

81486365 is a wasteful number, since it uses less digits than its factorization.

81486365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10479.

The product of its digits is 138240, while the sum is 41.

The square root of 81486365 is about 9026.9798382405. The cubic root of 81486365 is about 433.5391431959.

It can be divided in two parts, 8148 and 6365, that multiplied together give a triangular number (51862020 = T₁₀₁₈₄).

The spelling of 81486365 in words is "eighty-one million, four hundred eighty-six thousand, three hundred sixty-five".