81150801 has 16 divisors (see below), whose sum is σ = 110582208.
Its totient is φ = 52920000.
The previous prime is 81150793. The next prime is 81150803. The reversal of 81150801 is 10805118.
It is not a de Polignac number, because 81150801 - 23 = 81150793 is a prime.
It is not an unprimeable number, because it can be changed into a prime (81150803) 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, 34926 + ... + 37176.
It is an arithmetic number, because the mean of its divisors is an integer number (6911388).
Almost surely, 281150801 is an apocalyptic number.
It is an amenable number.
81150801 is a deficient number, since it is larger than the sum of its proper divisors (29431407).
81150801 is a wasteful number, since it uses less digits than its factorization.
81150801 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2512.
The product of its (nonzero) digits is 320, while the sum is 24.
The square root of 81150801 is about 9008.3739376205.
The cubic root of 81150801 is about 432.9432141110.
Adding to 81150801 its reverse (10805118), we get a palindrome (91955919).
The spelling of 81150801 in words is "eighty-one million, one hundred fifty thousand, eight hundred one".