131215525 has 12 divisors (see below), whose sum is σ = 185951392. Its totient is φ = 89976240.

The previous prime is 131215523. The next prime is 131215573. The reversal of 131215525 is 525512131.

It is not a de Polignac number, because 131215525 - 2¹ = 131215523 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131215525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131215523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 374727 + ... + 375076.

Almost surely, 2^131215525 is an apocalyptic number.

It is an amenable number.

131215525 is a deficient number, since it is larger than the sum of its proper divisors (54735867).

131215525 is an equidigital number, since it uses as much as digits as its factorization.

131215525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749820 (or 749815 counting only the distinct ones).

The product of its digits is 1500, while the sum is 25.

The square root of 131215525 is about 11454.9345262206. The cubic root of 131215525 is about 508.1536789372.

Adding to 131215525 its product of digits (1500), we get a square (131217025 = 11455²).

Adding to 131215525 its reverse (525512131), we get a palindrome (656727656).

The spelling of 131215525 in words is "one hundred thirty-one million, two hundred fifteen thousand, five hundred twenty-five".