81962255 has 4 divisors (see below), whose sum is σ = 98354712. Its totient is φ = 65569800.

The previous prime is 81962227. The next prime is 81962261. The reversal of 81962255 is 55226918.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 81962255 - 2⁶ = 81962191 is a prime.

It is a super-2 number, since 2×81962255² = 13435622489370050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 8196221 + ... + 8196230.

It is an arithmetic number, because the mean of its divisors is an integer number (24588678).

Almost surely, 2^81962255 is an apocalyptic number.

81962255 is a deficient number, since it is larger than the sum of its proper divisors (16392457).

81962255 is a wasteful number, since it uses less digits than its factorization.

81962255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16392456.

The product of its digits is 43200, while the sum is 38.

The square root of 81962255 is about 9053.3007792738. The cubic root of 81962255 is about 434.3814788123.

The spelling of 81962255 in words is "eighty-one million, nine hundred sixty-two thousand, two hundred fifty-five".