131217525 has 18 divisors (see below), whose sum is σ = 235025570. Its totient is φ = 69982560.

The previous prime is 131217517. The next prime is 131217587. The reversal of 131217525 is 525712131.

131217525 is a `hidden beast` number, since 13 + 121 + 7 + 525 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 23409 + 131194116 = 153^2 + 11454^2 .

It is not a de Polignac number, because 131217525 - 2³ = 131217517 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 291370 + ... + 291819.

Almost surely, 2^131217525 is an apocalyptic number.

131217525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131217525 is a deficient number, since it is larger than the sum of its proper divisors (103808045).

131217525 is a wasteful number, since it uses less digits than its factorization.

131217525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583205 (or 583197 counting only the distinct ones).

The product of its digits is 2100, while the sum is 27.

The square root of 131217525 is about 11455.0218245100. The cubic root of 131217525 is about 508.1562607003.

Adding to 131217525 its reverse (525712131), we get a palindrome (656929656).

The spelling of 131217525 in words is "one hundred thirty-one million, two hundred seventeen thousand, five hundred twenty-five".