81450201 has 24 divisors (see below), whose sum is σ = 129029760. Its totient is φ = 45548832.

The previous prime is 81450157. The next prime is 81450211. The reversal of 81450201 is 10205418.

It is not a de Polignac number, because 81450201 - 2⁷ = 81450073 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (81450211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1015 + ... + 12803.

It is an arithmetic number, because the mean of its divisors is an integer number (5376240).

Almost surely, 2^81450201 is an apocalyptic number.

It is an amenable number.

81450201 is a deficient number, since it is larger than the sum of its proper divisors (47579559).

81450201 is a wasteful number, since it uses less digits than its factorization.

81450201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11853 (or 11846 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 81450201 is about 9024.9765096647. The cubic root of 81450201 is about 433.4749981922.

Adding to 81450201 its reverse (10205418), we get a palindrome (91655619).

It can be divided in two parts, 814 and 50201, that added together give a palindrome (51015).

The spelling of 81450201 in words is "eighty-one million, four hundred fifty thousand, two hundred one".