81310120203 has 8 divisors (see below), whose sum is σ = 116752993168. Its totient is φ = 50036997024.

The previous prime is 81310120201. The next prime is 81310120217. The reversal of 81310120203 is 30202101318.

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

It is not a de Polignac number, because 81310120203 - 2¹ = 81310120201 is a prime.

It is a super-2 number, since 2×81310120203² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81310120203.

It is not an unprimeable number, because it can be changed into a prime (81310120201) 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, 1042437400 + ... + 1042437477.

It is an arithmetic number, because the mean of its divisors is an integer number (14594124146).

Almost surely, 2^81310120203 is an apocalyptic number.

81310120203 is a deficient number, since it is larger than the sum of its proper divisors (35442872965).

81310120203 is a wasteful number, since it uses less digits than its factorization.

81310120203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2084874893.

The product of its (nonzero) digits is 288, while the sum is 21.

The spelling of 81310120203 in words is "eighty-one billion, three hundred ten million, one hundred twenty thousand, two hundred three".