225131240 has 16 divisors (see below), whose sum is σ = 506545380. Its totient is φ = 90052480.

The previous prime is 225131233. The next prime is 225131251. The reversal of 225131240 is 42131522.

It can be written as a sum of positive squares in 2 ways, for example, as 217916644 + 7214596 = 14762^2 + 2686^2 .

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

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, 2814101 + ... + 2814180.

Almost surely, 2^225131240 is an apocalyptic number.

225131240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225131240 is an abundant number, since it is smaller than the sum of its proper divisors (281414140).

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

225131240 is a wasteful number, since it uses less digits than its factorization.

225131240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5628292 (or 5628288 counting only the distinct ones).

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

The square root of 225131240 is about 15004.3740289290. The cubic root of 225131240 is about 608.3384326004.

Adding to 225131240 its reverse (42131522), we get a palindrome (267262762).

The spelling of 225131240 in words is "two hundred twenty-five million, one hundred thirty-one thousand, two hundred forty".