81042655 has 8 divisors (see below), whose sum is σ = 102971952. Its totient is φ = 61020288.

The previous prime is 81042653. The next prime is 81042667. The reversal of 81042655 is 55624018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81042655 - 2¹ = 81042653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81042653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 476637 + ... + 476806.

It is an arithmetic number, because the mean of its divisors is an integer number (12871494).

Almost surely, 2^81042655 is an apocalyptic number.

81042655 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

81042655 is a deficient number, since it is larger than the sum of its proper divisors (21929297).

81042655 is a wasteful number, since it uses less digits than its factorization.

81042655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953465.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 81042655 is about 9002.3694103275. The cubic root of 81042655 is about 432.7508073389.

The spelling of 81042655 in words is "eighty-one million, forty-two thousand, six hundred fifty-five".