131225240 has 32 divisors (see below), whose sum is σ = 295602480. Its totient is φ = 52428672.

The previous prime is 131225231. The next prime is 131225251. The reversal of 131225240 is 42522131.

It is a super-2 number, since 2×131225240² = 34440127226115200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 50042 + ... + 52598.

Almost surely, 2^131225240 is an apocalyptic number.

131225240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131225240 is an abundant number, since it is smaller than the sum of its proper divisors (164377240).

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

131225240 is a wasteful number, since it uses less digits than its factorization.

131225240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3851 (or 3847 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 131225240 is about 11455.3585714285. The cubic root of 131225240 is about 508.1662196056.

Adding to 131225240 its reverse (42522131), we get a palindrome (173747371).

The spelling of 131225240 in words is "one hundred thirty-one million, two hundred twenty-five thousand, two hundred forty".