131121440 has 24 divisors (see below), whose sum is σ = 309774780. Its totient is φ = 52448512.

The previous prime is 131121439. The next prime is 131121457. The reversal of 131121440 is 44121131.

It is a happy number.

131121440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 119858704 + 11262736 = 10948^2 + 3356^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409595 + ... + 409914.

Almost surely, 2^131121440 is an apocalyptic number.

131121440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131121440 is an abundant number, since it is smaller than the sum of its proper divisors (178653340).

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

131121440 is an equidigital number, since it uses as much as digits as its factorization.

131121440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819524 (or 819516 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 131121440 is about 11450.8270443667. The cubic root of 131121440 is about 508.0321966904.

Adding to 131121440 its reverse (44121131), we get a palindrome (175242571).

The spelling of 131121440 in words is "one hundred thirty-one million, one hundred twenty-one thousand, four hundred forty".