81307227 has 8 divisors (see below), whose sum is σ = 110716416. Its totient is φ = 53051432.

The previous prime is 81307211. The next prime is 81307253. The reversal of 81307227 is 72270318.

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

It is a cyclic number.

It is not a de Polignac number, because 81307227 - 2⁴ = 81307211 is a prime.

It is a super-3 number, since 3×81307227³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 81307194 and 81307203.

It is not an unprimeable number, because it can be changed into a prime (81307297) 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, 288183 + ... + 288464.

It is an arithmetic number, because the mean of its divisors is an integer number (13839552).

Almost surely, 2^81307227 is an apocalyptic number.

81307227 is a deficient number, since it is larger than the sum of its proper divisors (29409189).

81307227 is a wasteful number, since it uses less digits than its factorization.

81307227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576697.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 81307227 is about 9017.0520127146. The cubic root of 81307227 is about 433.2212155041.

The spelling of 81307227 in words is "eighty-one million, three hundred seven thousand, two hundred twenty-seven".