81255335 has 16 divisors (see below), whose sum is σ = 111585600. Its totient is φ = 55643136.

The previous prime is 81255329. The next prime is 81255347. The reversal of 81255335 is 53355218.

It is a cyclic number.

It is not a de Polignac number, because 81255335 - 2¹⁰ = 81254311 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42071 + ... + 43959.

It is an arithmetic number, because the mean of its divisors is an integer number (6974100).

Almost surely, 2^81255335 is an apocalyptic number.

81255335 is a deficient number, since it is larger than the sum of its proper divisors (30330265).

81255335 is a wasteful number, since it uses less digits than its factorization.

81255335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3130.

The product of its digits is 18000, while the sum is 32.

The square root of 81255335 is about 9014.1741163570. The cubic root of 81255335 is about 433.1290322284.

The spelling of 81255335 in words is "eighty-one million, two hundred fifty-five thousand, three hundred thirty-five".