81962267 has 4 divisors (see below), whose sum is σ = 81983640. Its totient is φ = 81940896.

The previous prime is 81962261. The next prime is 81962281. The reversal of 81962267 is 76226918.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76226918 = 2 ⋅38113459.

It is a cyclic number.

It is not a de Polignac number, because 81962267 - 2⁶ = 81962203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81962261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3173 + ... + 13190.

It is an arithmetic number, because the mean of its divisors is an integer number (20495910).

Almost surely, 2^81962267 is an apocalyptic number.

81962267 is a deficient number, since it is larger than the sum of its proper divisors (21373).

81962267 is a wasteful number, since it uses less digits than its factorization.

81962267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21372.

The product of its digits is 72576, while the sum is 41.

The square root of 81962267 is about 9053.3014420155. The cubic root of 81962267 is about 434.3815000114.

The spelling of 81962267 in words is "eighty-one million, nine hundred sixty-two thousand, two hundred sixty-seven".