81825355 has 16 divisors (see below), whose sum is σ = 100859904. Its totient is φ = 63697120.

The previous prime is 81825353. The next prime is 81825371. The reversal of 81825355 is 55352818.

It is not a de Polignac number, because 81825355 - 2¹ = 81825353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81825353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43974 + ... + 45796.

It is an arithmetic number, because the mean of its divisors is an integer number (6303744).

Almost surely, 2^81825355 is an apocalyptic number.

81825355 is a deficient number, since it is larger than the sum of its proper divisors (19034549).

81825355 is a wasteful number, since it uses less digits than its factorization.

81825355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2066.

The product of its digits is 48000, while the sum is 37.

The square root of 81825355 is about 9045.7368411866. The cubic root of 81825355 is about 434.1394976550.

The spelling of 81825355 in words is "eighty-one million, eight hundred twenty-five thousand, three hundred fifty-five".