81330275 has 24 divisors (see below), whose sum is σ = 109149264. Its totient is φ = 59760000.

The previous prime is 81330269. The next prime is 81330299. The reversal of 81330275 is 57203318.

It is not a de Polignac number, because 81330275 - 2⁴ = 81330259 is a prime.

It is a super-2 number, since 2×81330275² = 13229227263151250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81077 + ... + 82073.

It is an arithmetic number, because the mean of its divisors is an integer number (4547886).

Almost surely, 2^81330275 is an apocalyptic number.

81330275 is a deficient number, since it is larger than the sum of its proper divisors (27818989).

81330275 is a wasteful number, since it uses less digits than its factorization.

81330275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271 (or 1266 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 81330275 is about 9018.3299451728. The cubic root of 81330275 is about 433.2621464259.

The spelling of 81330275 in words is "eighty-one million, three hundred thirty thousand, two hundred seventy-five".