81030235253 has 4 divisors (see below), whose sum is σ = 88396620288. Its totient is φ = 73663850220.

The previous prime is 81030235243. The next prime is 81030235271. The reversal of 81030235253 is 35253203018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81030235253 - 2¹⁴ = 81030218869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81030235243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3683192501 + ... + 3683192522.

It is an arithmetic number, because the mean of its divisors is an integer number (22099155072).

Almost surely, 2^81030235253 is an apocalyptic number.

It is an amenable number.

81030235253 is a deficient number, since it is larger than the sum of its proper divisors (7366385035).

81030235253 is a wasteful number, since it uses less digits than its factorization.

81030235253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7366385034.

The product of its (nonzero) digits is 21600, while the sum is 32.

The spelling of 81030235253 in words is "eighty-one billion, thirty million, two hundred thirty-five thousand, two hundred fifty-three".