81851301 has 12 divisors (see below), whose sum is σ = 135119712. Its totient is φ = 46772136.

The previous prime is 81851291. The next prime is 81851303. The reversal of 81851301 is 10315818.

It is not a de Polignac number, because 81851301 - 2¹⁰ = 81850277 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81851303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 649551 + ... + 649676.

It is an arithmetic number, because the mean of its divisors is an integer number (11259976).

Almost surely, 2^81851301 is an apocalyptic number.

It is an amenable number.

81851301 is a deficient number, since it is larger than the sum of its proper divisors (53268411).

81851301 is a wasteful number, since it uses less digits than its factorization.

81851301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299240 (or 1299237 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The square root of 81851301 is about 9047.1708837625. The cubic root of 81851301 is about 434.1853799003.

The spelling of 81851301 in words is "eighty-one million, eight hundred fifty-one thousand, three hundred one".