201431231440 has 40 divisors (see below), whose sum is σ = 492976438560. Its totient is φ = 76331834496.

The previous prime is 201431231413. The next prime is 201431231461. The reversal of 201431231440 is 44132134102.

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

It is a congruent number.

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, 66258754 + ... + 66261793.

It is an arithmetic number, because the mean of its divisors is an integer number (12324410964).

Almost surely, 2^201431231440 is an apocalyptic number.

201431231440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201431231440 is an abundant number, since it is smaller than the sum of its proper divisors (291545207120).

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

201431231440 is a wasteful number, since it uses less digits than its factorization.

201431231440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132520579 (or 132520573 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 201431231440 its reverse (44132134102), we get a palindrome (245563365542).

The spelling of 201431231440 in words is "two hundred one billion, four hundred thirty-one million, two hundred thirty-one thousand, four hundred forty".