81086263 has 4 divisors (see below), whose sum is σ = 82415608. Its totient is φ = 79756920.

The previous prime is 81086251. The next prime is 81086309. The reversal of 81086263 is 36268018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36268018 = 2 ⋅18134009.

It is a cyclic number.

It is not a de Polignac number, because 81086263 - 2¹³ = 81078071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81086963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 664581 + ... + 664702.

It is an arithmetic number, because the mean of its divisors is an integer number (20603902).

Almost surely, 2^81086263 is an apocalyptic number.

81086263 is a deficient number, since it is larger than the sum of its proper divisors (1329345).

81086263 is a wasteful number, since it uses less digits than its factorization.

81086263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329344.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 81086263 is about 9004.7911136239. The cubic root of 81086263 is about 432.8284126173.

The spelling of 81086263 in words is "eighty-one million, eighty-six thousand, two hundred sixty-three".