131155440 has 160 divisors (see below), whose sum is σ = 442638336. Its totient is φ = 31933440.

The previous prime is 131155439. The next prime is 131155441. The reversal of 131155440 is 44551131.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (131155439) and next prime (131155441).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 131155440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131155441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 396075 + ... + 396405.

Almost surely, 2^131155440 is an apocalyptic number.

131155440 is a gapful number since it is divisible by the number (10) 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 131155440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221319168).

131155440 is an abundant number, since it is smaller than the sum of its proper divisors (311482896).

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

131155440 is a wasteful number, since it uses less digits than its factorization.

131155440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 481 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 131155440 is about 11452.3115570613. The cubic root of 131155440 is about 508.0761040838.

The spelling of 131155440 in words is "one hundred thirty-one million, one hundred fifty-five thousand, four hundred forty".