81250555 has 8 divisors (see below), whose sum is σ = 102632400. Its totient is φ = 61579296.

The previous prime is 81250541. The next prime is 81250567. The reversal of 81250555 is 55505218.

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 81250555 - 2¹¹ = 81248507 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427540 + ... + 427729.

It is an arithmetic number, because the mean of its divisors is an integer number (12829050).

Almost surely, 2^81250555 is an apocalyptic number.

81250555 is a deficient number, since it is larger than the sum of its proper divisors (21381845).

81250555 is a wasteful number, since it uses less digits than its factorization.

81250555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855293.

The product of its (nonzero) digits is 10000, while the sum is 31.

The square root of 81250555 is about 9013.9089744683. The cubic root of 81250555 is about 433.1205388481.

The spelling of 81250555 in words is "eighty-one million, two hundred fifty thousand, five hundred fifty-five".