81358023 has 8 divisors (see below), whose sum is σ = 109206000. Its totient is φ = 53874368.

The previous prime is 81358001. The next prime is 81358087. The reversal of 81358023 is 32085318.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 81358023 - 2⁶ = 81357959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81358423) 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, 90558 + ... + 91451.

It is an arithmetic number, because the mean of its divisors is an integer number (13650750).

Almost surely, 2^81358023 is an apocalyptic number.

81358023 is a deficient number, since it is larger than the sum of its proper divisors (27847977).

81358023 is a wasteful number, since it uses less digits than its factorization.

81358023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182161.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 81358023 is about 9019.8682362882. The cubic root of 81358023 is about 433.3114138156.

The spelling of 81358023 in words is "eighty-one million, three hundred fifty-eight thousand, twenty-three".