81003002851 has 2 divisors, whose sum is σ = 81003002852. Its totient is φ = 81003002850.

The previous prime is 81003002837. The next prime is 81003002887. The reversal of 81003002851 is 15820030018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81003002851 - 2³¹ = 78855519203 is a prime.

It is a super-2 number, since 2×81003002851² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81003002831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40501501425 + 40501501426.

It is an arithmetic number, because the mean of its divisors is an integer number (40501501426).

Almost surely, 2^81003002851 is an apocalyptic number.

81003002851 is a deficient number, since it is larger than the sum of its proper divisors (1).

81003002851 is an equidigital number, since it uses as much as digits as its factorization.

81003002851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 28.

Adding to 81003002851 its reverse (15820030018), we get a palindrome (96823032869).

The spelling of 81003002851 in words is "eighty-one billion, three million, two thousand, eight hundred fifty-one".