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81150801 = 3611972251
BaseRepresentation
bin1001101011001…
…00001101010001
312122200212222020
410311210031101
5131233311201
612015202053
72003525154
oct465441521
9178625866
1081150801
1141897886
1223216329
1313a74134
14aac5c9b
1571cea36
hex4d64351

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".

Divisors: 1 3 61 183 197 591 2251 6753 12017 36051 137311 411933 443447 1330341 27050267 81150801