81270226 has 8 divisors (see below), whose sum is σ = 122024700. Its totient is φ = 40595328.

The previous prime is 81270187. The next prime is 81270229. The reversal of 81270226 is 62207218.

It is a Cunningham number, because it is equal to 9015²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 81270225 + 1 = 9015^2 + 1^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 81270194 and 81270203.

It is not an unprimeable number, because it can be changed into a prime (81270229) 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, 17271 + ... + 21466.

Almost surely, 2^81270226 is an apocalyptic number.

81270226 is a deficient number, since it is larger than the sum of its proper divisors (40754474).

81270226 is a wasteful number, since it uses less digits than its factorization.

81270226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39788.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 81270226 is about 9015.0000554631. Note that the first 4 decimals coincide. The cubic root of 81270226 is about 433.1554892828.

The spelling of 81270226 in words is "eighty-one million, two hundred seventy thousand, two hundred twenty-six".