81023201 has 12 divisors (see below), whose sum is σ = 97731072. Its totient is φ = 65791224.

The previous prime is 81023191. The next prime is 81023203. The reversal of 81023201 is 10232018.

It is not a de Polignac number, because 81023201 - 2¹⁴ = 81006817 is a prime.

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 81023201.

It is not an unprimeable number, because it can be changed into a prime (81023203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13505 + ... + 18558.

It is an arithmetic number, because the mean of its divisors is an integer number (8144256).

Almost surely, 2^81023201 is an apocalyptic number.

It is an amenable number.

81023201 is a deficient number, since it is larger than the sum of its proper divisors (16707871).

81023201 is a wasteful number, since it uses less digits than its factorization.

81023201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32108 (or 32089 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 81023201 is about 9001.2888521589. The cubic root of 81023201 is about 432.7161778058.

Adding to 81023201 its reverse (10232018), we get a palindrome (91255219).

The spelling of 81023201 in words is "eighty-one million, twenty-three thousand, two hundred one".