201311280 has 120 divisors (see below), whose sum is σ = 715882752. Its totient is φ = 50522112.

The previous prime is 201311239. The next prime is 201311291. The reversal of 201311280 is 82113102.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4017 + ... + 20463.

Almost surely, 2^201311280 is an apocalyptic number.

201311280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201311280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (357941376).

201311280 is an abundant number, since it is smaller than the sum of its proper divisors (514571472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201311280 is a wasteful number, since it uses less digits than its factorization.

201311280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16483 (or 16474 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 201311280 is about 14188.4206309229. The cubic root of 201311280 is about 586.0788332558.

Adding to 201311280 its reverse (82113102), we get a palindrome (283424382).

The spelling of 201311280 in words is "two hundred one million, three hundred eleven thousand, two hundred eighty".