131521435 has 16 divisors (see below), whose sum is σ = 167378400. Its totient is φ = 98868736.

The previous prime is 131521433. The next prime is 131521451. The reversal of 131521435 is 534125131.

It is a happy number.

It is not a de Polignac number, because 131521435 - 2¹ = 131521433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131521433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103836 + ... + 105094.

It is an arithmetic number, because the mean of its divisors is an integer number (10461150).

Almost surely, 2^131521435 is an apocalyptic number.

131521435 is a deficient number, since it is larger than the sum of its proper divisors (35856965).

131521435 is a wasteful number, since it uses less digits than its factorization.

131521435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2510.

The product of its digits is 1800, while the sum is 25.

The square root of 131521435 is about 11468.2795135103. The cubic root of 131521435 is about 508.5482680318.

Adding to 131521435 its reverse (534125131), we get a palindrome (665646566).

The spelling of 131521435 in words is "one hundred thirty-one million, five hundred twenty-one thousand, four hundred thirty-five".