81351102023 has 4 divisors (see below), whose sum is σ = 81706347240. Its totient is φ = 80995856808.

The previous prime is 81351101989. The next prime is 81351102029. The reversal of 81351102023 is 32020115318.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81351102023 - 2¹⁸ = 81350839879 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81351101983 and 81351102001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81351102029) 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, 177622265 + ... + 177622722.

It is an arithmetic number, because the mean of its divisors is an integer number (20426586810).

Almost surely, 2^81351102023 is an apocalyptic number.

81351102023 is a deficient number, since it is larger than the sum of its proper divisors (355245217).

81351102023 is a wasteful number, since it uses less digits than its factorization.

81351102023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355245216.

The product of its (nonzero) digits is 1440, while the sum is 26.

The spelling of 81351102023 in words is "eighty-one billion, three hundred fifty-one million, one hundred two thousand, twenty-three".