131511225 has 24 divisors (see below), whose sum is σ = 219440320. Its totient is φ = 69491520.

The previous prime is 131511223. The next prime is 131511229. The reversal of 131511225 is 522115131.

It is not a de Polignac number, because 131511225 - 2¹ = 131511223 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131511223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132 + ... + 16218.

Almost surely, 2^131511225 is an apocalyptic number.

131511225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131511225 is a deficient number, since it is larger than the sum of its proper divisors (87929095).

131511225 is a wasteful number, since it uses less digits than its factorization.

131511225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16209 (or 16204 counting only the distinct ones).

The product of its digits is 300, while the sum is 21.

The square root of 131511225 is about 11467.8343639939. The cubic root of 131511225 is about 508.5351081689.

Adding to 131511225 its reverse (522115131), we get a palindrome (653626356).

The spelling of 131511225 in words is "one hundred thirty-one million, five hundred eleven thousand, two hundred twenty-five".