81330475 has 6 divisors (see below), whose sum is σ = 100849820. Its totient is φ = 65064360.

The previous prime is 81330467. The next prime is 81330479. The reversal of 81330475 is 57403318.

It is not a de Polignac number, because 81330475 - 2³ = 81330467 is a prime.

It is a super-2 number, since 2×81330475² = 13229292327451250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81330479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1626585 + ... + 1626634.

Almost surely, 2^81330475 is an apocalyptic number.

81330475 is a deficient number, since it is larger than the sum of its proper divisors (19519345).

81330475 is a wasteful number, since it uses less digits than its factorization.

81330475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3253229 (or 3253224 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 81330475 is about 9018.3410336935. The cubic root of 81330475 is about 433.2625015719.

The spelling of 81330475 in words is "eighty-one million, three hundred thirty thousand, four hundred seventy-five".