201131440 has 40 divisors (see below), whose sum is σ = 472469760. Its totient is φ = 79620096.

The previous prime is 201131423. The next prime is 201131453. The reversal of 201131440 is 44131102.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5200 + ... + 20719.

It is an arithmetic number, because the mean of its divisors is an integer number (11811744).

Almost surely, 2^201131440 is an apocalyptic number.

201131440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201131440 is an abundant number, since it is smaller than the sum of its proper divisors (271338320).

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

201131440 is a wasteful number, since it uses less digits than its factorization.

201131440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26029 (or 26023 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 201131440 is about 14182.0816525643. The cubic root of 201131440 is about 585.9042581414.

Adding to 201131440 its reverse (44131102), we get a palindrome (245262542).

The spelling of 201131440 in words is "two hundred one million, one hundred thirty-one thousand, four hundred forty".