81360861 has 8 divisors (see below), whose sum is σ = 114862464. Its totient is φ = 51049920.

The previous prime is 81360841. The next prime is 81360889. The reversal of 81360861 is 16806318.

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

It is not a de Polignac number, because 81360861 - 2⁷ = 81360733 is a prime.

It is a super-2 number, since 2×81360861² = 13239179405322642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81360841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 797605 + ... + 797706.

It is an arithmetic number, because the mean of its divisors is an integer number (14357808).

Almost surely, 2^81360861 is an apocalyptic number.

It is an amenable number.

81360861 is a deficient number, since it is larger than the sum of its proper divisors (33501603).

81360861 is a wasteful number, since it uses less digits than its factorization.

81360861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595331.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 81360861 is about 9020.0255542875. The cubic root of 81360861 is about 433.3164521366.

The spelling of 81360861 in words is "eighty-one million, three hundred sixty thousand, eight hundred sixty-one".