131520434 has 4 divisors (see below), whose sum is σ = 197280654. Its totient is φ = 65760216.

The previous prime is 131520419. The next prime is 131520439. The reversal of 131520434 is 434025131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 434025131 = 79 ⋅5493989.

It can be written as a sum of positive squares in only one way, i.e., 74563225 + 56957209 = 8635^2 + 7547^2 .

It is not an unprimeable number, because it can be changed into a prime (131520439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32880107 + ... + 32880110.

Almost surely, 2^131520434 is an apocalyptic number.

131520434 is a deficient number, since it is larger than the sum of its proper divisors (65760220).

131520434 is an equidigital number, since it uses as much as digits as its factorization.

131520434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65760219.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 131520434 is about 11468.2358713099. The cubic root of 131520434 is about 508.5469778540.

Adding to 131520434 its reverse (434025131), we get a palindrome (565545565).

The spelling of 131520434 in words is "one hundred thirty-one million, five hundred twenty thousand, four hundred thirty-four".