81010023 has 16 divisors (see below), whose sum is σ = 110388096. Its totient is φ = 52825760.

The previous prime is 81010003. The next prime is 81010043. The reversal of 81010023 is 32001018.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81010003) and next prime (81010043).

It is a cyclic number.

It is not a de Polignac number, because 81010023 - 2¹² = 81005927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81009984 and 81010011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81010003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73708 + ... + 74798.

It is an arithmetic number, because the mean of its divisors is an integer number (6899256).

Almost surely, 2^81010023 is an apocalyptic number.

81010023 is a deficient number, since it is larger than the sum of its proper divisors (29378073).

81010023 is a wasteful number, since it uses less digits than its factorization.

81010023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1614.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 81010023 is about 9000.5568161087. The cubic root of 81010023 is about 432.6927168592.

The spelling of 81010023 in words is "eighty-one million, ten thousand, twenty-three".